Candace calls Jeremy, who is currently in Paris to ask about how his trip is going, in spite of that it's 2:00 a.m. where he currently is. Though a bit discontent with being disturbed as early as he was, he tells Candace that she was in his dream and that they were in a Dixieland band with an iguana playing the oboe. The call is interrupted and ended when Candace hears repeated blunt stomping from the backyard. Phineas and Ferb are outside watching their latest creation, a giant robot, jump rope. Candace, storming out into the yard, tries to call Linda to inform her of another insane project of her brothers, but Linda can't hear her on account of the construction on the street she is stuck on. By the time Linda arrives at the house, the rope jumping robot is gone, as expected.
As Phineas and Ferb look through a scrapbook with everything they've done over the summer, he comments on how 'mundane' they were and that he and his brother need a better challenge. He subsequently comes up with the idea of creating the 'longest, most fun day of summer ever' and begins work on their next project.
Meanwhile, on a commercial airliner high above, Heinz Doofenshmirtz and his daughter Vanessa are bound for Tokyo. Though Vanessa had wanted to go to Paris, she doesn't mind the change in plans for the thought of Tokyo being more exotic. The pilot announces that there would be a delay reaching Tokyo and Doofenshmirtz displays his irritation at how often public flights would be delayed, not showing much amusement to the fact that there is a giant rope jumping robot dangling from the plane's tail - the same one Phineas and Ferb had build the same day.
Linda and Lawrence Fletcher are leaving for the weekend, leaving Candace in charge. Linda prohibits Candace from inviting any boys over, though this wouldn't be a problem for the fact that Jeremy would be in Paris for the week. She also tells Candace that if ever she would have to call her concerning the boys' antics, she wouldn't be doing her job properly and would be in trouble as well.
Linda and Lawrence are set to depart as soon as Lawrence finds the rub and a book of puns he was looking for. As they leave in the station wagon, their children bid them a farewell. At five in the morning next day, Candace is disturbed by a dream about French girls trying to get Jeremy's attention and wakes up. Freaking out and fearing her chances of earning Jeremy's affection, she calls Stacy, who willingly suits up to come over. When Candace asks for her to bring breakfast, Stacy rudely hangs up.
Phineas and Ferb are also up unusually early, much to the curiosity of Isabella, her Fireside Girls troop and a throng of others. Phineas answers saying that they were intending to make the longest day of summer last even longer. He then pulls a sheet, which had oddly taken the shape of the Statue of Liberty, off a model of the sun and Earth's orbital pattern around it and begins to lecture the crowd on how they plan to do so.
Phineas announces that he plans to use the Sun-Beater 3000 to circumnavigate the world in a direction opposing its rotation so that they would get a full 24 hours of daylight. Buford opposes the plan and seriously doubts they can do it, prompting Phineas to bet on his success. Phineas then pulls out another sheet, which looks like The Discus Thrower, to unveil a model of the Earth and the sun, explaining how they'll complete the task. The final deal would be that Buford eat a bug and return their bikes he had taken from them if Phineas wins and that Phineas admit that he and his brother are governed by the laws of physics, summer isn't what they want to make of it, and that he must spend the rest of the summer doing nothing if he loses.
Though Isabella fears that Phineas will lose the bet, Phineas is ever confident he will succeed, and to demonstrate it, has Clay Aiken and Chaka Khan sing an inspirational song in a duet, but when the crowd stands on the wing to join them, it collapses from their weight.
Arriving in his lair via rotating pet bed, Perry gets a mission briefing from Carl Karl, reading a note that was allegedly written by Francis "Major" Monogram (in letters cut out of magazines) that claims he wasn't kidnapped and that he was on vacation. He tells Perry that Doofenshmirtz and his daughter are on vacation in Tokyo, which is also the location of the current Annual World Good Guy Convention where Monogram will be the speaker, so foiling the evil scientist would be unnecessary as Carl sees all this as coincidental. Perry, however, is aware something is wrong...
Over a breakfast of Japanese noodles, Candace talks with Stacy over her relationship with Jeremy. Because Jeremy has never called her his girlfriend, let alone kissed her, she is worried about him being single and in Paris with local women trying to get his attention. Stacy counters by saying that Candace declaring him her boyfriend would be valid. Candace, though have always thought it was supposed to work vice-versa, heeds this advice.
While retrieving their luggage at the Tokyo airport's baggage claim, Vanessa sees her dad picking up a dolly with Major Monogram tied to it from the conveyor belt and is irked that her father had taken work with him on a trip that was supposed to be devoted to him spending time with her.
As the wing is fixed back onto the aircraft with packing tape, Phineas goes over the map of the planned route. Buford decides to come along to make sure they wouldn't cheat and brings Baljeet with him as carry-on luggage. Candace comes out into the backyard, intending to impede what her brothers are doing, but changes her mind when she finds out that Paris is one of their stopovers. Stacy at first tries to negotiate Candace out of the decision, but Candace testifies saying that being in charge, she should supervise her brothers as they travel. Though seeing this as irrational, Stacy concurs and bids Candace a farewell. The aircraft launches and the Fireside Girls are left in charge of getting the backyard in shape for the welcoming party. Adyson Sweetwater tells Clay and Chaka to help clean up the mess, but the only was booked for an hour.
While she and her father loiter in the top floor of the Tokyo Tower, Vanessa is reading facts about it on a brochure and realizes that a giant water balloon she sees being hung on the top of the structure isn't supposed to be part of it. She finds out her father put it there and was planning to drop it on the Annual Good Guy Convention at the base of the tower and frame Major Monogram for perpetrating the prank.
Meanwhile, in another part of Tokyo, Phineas makes a wild gears-up landing on the motorway, damaging the undercarriage of the Sun-Beater 3000. The aircraft comes to rest in front of the residence of Stacy's relatives. In a stroke of fortune, Stacy's great aunt owns a tempura restaurant and willingly donates some of her vegetable oil to them to refuel the aircraft. After a spontaneous J-Pop musical number, the aircraft is once again in the air and bound for Paris.
Although Vanessa helps her father wheel Major Monogram to the top of Tokyo Tower, his involvement with his plan over her finally makes her angry enough to walk away from her father intent on flying to Paris. During this argument, she passes and greets Perry, who has arrived via helicopter and makes it his first priority to untie Monogram. Doofenshmirtz tries to negotiate her into staying, saying that he would drop the balloon right there and then so he could get to spending time with her, but is attacked by Perry, which causes him to drop the remote and activate it. The crane carrying the balloon starts to spin out of control and knocks Vanessa off the tower. Luckily for her, the Sun-Beater 3000 passes and catches her in the midst of her fall. Ferb opens the canopy and lets her into the aircraft. After hearing that they're heading to Paris and then back to Danville, Vanessa asks if she can tag along with them and is readily accepted.
Doofenshmirtz is displeased that the people who rescued his daughter are now running off with her and sought the cooperation of Major Monogram and Perry to pursue them. After a few moments of relentless pleading by Doofenshmirtz, Perry and Major Monogram agree to take him to his daughter and give chase after the Sun-Beater 3000 in Perry's hovercar.
As the Sun-Beater 3000 passes over the Himalayas, Phineas advocates for the passengers to keep their eyes out for Klimpaloon, a magical old-timey bathing suit rumored to be residing there. Candace objects, claiming that he only made it up. A quiet dispute over its existence begins between the two before the altimeter warbles with an alarm. Phineas realizes that the added weight by Vanessa could be hindering the aircraft's performance and flight ceiling. Not long afterward, the aircraft's wings are severed by a collision with a mountain summit and it comes crashing down on the mountainside. As the airframe comes to rest, Klimpaloon waddles past the aircraft, validating Phineas' claim.
Baljeet recalls an uncle of his residing not far from where they crashed and leads them to his area of residence. Candace and Vanessa stay behind, volunteering to guard the plane. Baljeet's uncle Sabu greets the visitors and welcomes them into his rubber band factory, where he sings about its production endeavors in a previously rehearsed Bollywood song. As the musical number closes, Phineas requests if he could be given a batch of giant rubber bands.
Candace and Vanessa venture further up the mountainside trying to gain reception on their cellphones while Doofenshmirtz closes in on them with a GPS locating device tracking a GPS beacon in Vanessa's earrings. Because the mountainside is too treacherous for Perry to be able to land the hovercraft on, Major Monogram equips Heinz with skydiving gear and tersely ejects him from the aircraft. Doofenshmirtz fails to deploy his parachute and slams into the ground rolling. As he rolls, snow builds up around his body and in a few seconds, he is tumbling towards the teens inside a massive snowball. Candace and Vanessa flee in panic towards the aircraft, which now has a large ball of rubber bands strapped underneath it. Ferb urgently tries to start the engine, but it stalls stubbornly. Vanessa makes it to the plane and Candace, still running, narrowly avoids being hit by the snowball before it plows into the aircraft and sends it off the cliff.
However, the ball of rubber bands it was strapped to rebounds the airframe vertically upward and Candace is able to climb in before the aircraft is thrust forward. Doofenshmirtz, unseen by the group, has been propelled skyward from the Sun-Beater's engine and hits the ground uninjured beside the parked hovercar Perry had managed to find a landing area for. Repeating the process of using the rubber ball to rebound the plane from the ground and thrust forth, the group continues west across the globe and sees many sites before managing to reach Paris, where they run out of rubber bands and crash-land into a river.
The Sun-Beater 3000 is washed up on a riverside in Paris. Phineas tells everyone they need fuel and parts so they should all split up to find them. Candace heads off to see Jeremy, Buford and Baljeet are to go get some additional fuel, and Ferb goes to the Eiffel Tower with Vanessa to plot the directions back home. Phineas decides he will go look for some parts and invites Isabella to come along with him and she quickly agrees.
Candace walks around Paris trying to find the hotel Jeremy is staying in. She comes across a bilingual French woman with knowledge over English but assumes she only knows French. After an awkward communication blunder trying to use a French-English Dictionary, Candace leaves and spots Jeremy around the next corner. She tries to say hi but leaves dejected when she sees him enjoying his time with some local students. At the same time, Isabella tries to seize a romantic moment with Phineas. She sings to Phineas in her effort to try and shift his attention away from trying to repairing the plane and towards spending time with her, but frustratingly fails.
When Buford and Baljeet arrive at a café to ask for vegetable oil, Baljeet asks the manager but is rejected. However, when Buford steps forward and makes the same request in very fluent French, he is approved just before warning Baljeet not to tell the others. Phineas managed to find a pair of large plastic baguettes being thrown out which he plans to use to fasten to the Sun-Beater 3000 using their remaining rubber bands and convert it into a boat.
Ferb and Vanessa are atop the Eiffel Tower while Vanessa talks about how frustrating it is that her father puts his work ahead of her when she only wanted to spend time with him. Ferb in turn suggests that if one loves another, they must meet that person halfway. He then decides to head off to a flower shop on the tower to buy her a bouquet.
While Ferb is away, Doofenshmirtz, Perry, and Major Monogram arrive in the hover-car to pick her up. Though Vanessa is still mad at her father for bringing work with him on their trip, she realizes how much trouble he had gone through to find her and decides to rejoin him. When Ferb returns with the bouquet, she was gone, to his dismay. As everyone is reunited at the plane on the riverside, Phineas expresses feeling sorrow for Ferb and Candace, who never received the opportunity to spend time with their special partners, much to Isabella's frustration.
When Candace reveals that she hadn't had the self-esteem to approach Jeremy who was apparently enjoying his time without her, Phineas recalls Clay Aiken's song to help motivate Candace to believe in herself, and reassures her that she will succeed, as she did during all the previous times her confidence was put to the test.
Jeremy sees Candace at the bridge and is surprised that she has arrived in Paris on such short notice. Candace explains to him that her brothers were circumnavigating the world and accidentally brings up that she saw him in front of his hotel with some French girls. Upon learning this, Jeremy is offended and tells her, "I thought my girlfriend would have more trust in me than that." Candace is surprised as well as delighted as her official boyfriend declares her his girlfriend. They prepare to share a kiss with each other but lose the chance to do so as the aircraft she is standing on drifts away in the current. Candace, disappointed, returns to her seat in the aircraft by Isabella, who remarks with envy that Candace was fortunate to have a love scene at the bridge when she herself had none. Buford weighs in by quoting French philosopher Voltaire.
Phineas reassures Candace that she would be reunited with Jeremy soon and reignites the engine, pushing it to full throttle. Skimming through the river at a high speed, they make it out to the Atlantic in a short time frame. Phineas is glad to be ahead of schedule and looks forward to arriving in Danville earlier than expected. However, as they dart west across the ocean, the airframe collapses and disintegrates under the stress of rushing water. Candace is extremely frustrated and distraught at the fact that they're now stranded on a desert island while Buford taunts Phineas, satisfied to be winning the bet in spite of the circumstances. Phineas, though optimistic and confident he can get them out of their predicament, soon realizes he has nothing to work with. His searches for a means of escape become desperate.
In Paris, Doofenshmirtz thanks Major Monogram and Perry for their cooperation and starts to leave with his daughter before being stopped and handcuffed by the Major. As he is taken into custody, Vanessa stalls them by threatening them with a handheld weapon and escapes with her father in the hovercar. Though Vanessa denies it and reveals the weapon was actually a hairdryer, Doofenshmirtz is proud of the evil potential he has seen in his daughter.
Phineas' optimism has been replaced by desperation and he is now frantically digging a large hole in the sand for anything they can possibly use to escape. Despite his efforts, his search yields nothing but a sea sponge and a starfish. Isabella, downcast, heads off to the edge of the beach and sits down to watch the sunset. Before long, she begins to cry. Ferb consoles her, offering a handkerchief to blow her nose on. This calms her down enough for her to open up to Ferb how frustrating it is that Phineas would barely notice her and she feels like giving up. She gestures to Phineas, who finds a sponge and a starfish, but throws them away due to neither of them helping. Isabella adds it's as if she doesn't exist, and would give anything if Phineas would sit with her and watch the sunset.
Phineas promptly runs to Isabella's side making a final vain suggestion that they could dig a tunnel underneath the ocean, before finally giving up. Still trying to look on the bright side of things, he sits down by Isabella and says at least they can enjoy the sunset. While she is silent at first, Isabella finds herself unhappy with how emotionally broken he is and tries to snap him out of it by reminding him about his past inventions, but suddenly changes one sentence when she almost reveals her crush on him. When she points out how confident he had been working out the route on Ferb's map, Phineas makes a realization and snaps into action. He gives Isabella a thankful hug before getting to work, not noticing that left her in a trance.
Coordinating the group, Phineas has them fold the giant map into a paper airplane. After placing the seats from the original Sun-Beater 3000 in it, Phineas puts their remaining rubber band around two palm trees to make an improvised slingshot. Candace is at first extremely doubtful that what Phineas has planned will work, but decides to join in when Phineas reminds her it's her only hope for her to see Jeremy again. After adjusting the slingshot and aiming the plane in Danville's direction, Phineas gives the go order for everyone to board the makeshift aircraft and launches it.
The plane darts over the Atlantic at an extreme speed, and a short time after passing over New York City and crossing into the mainland, crash-lands into suburban Danville a few blocks from Phineas and Ferb's backyard with only a minute until sundown. Though they've reached the homestretch, the road construction Linda took an hour to navigate around blocks their path as a final obstacle. Realizing they're near his house, Buford leads the group into his garage to return their bikes. Everyone in the group is accounted for with their bicycle except for Candace, for whom only a tricycle is available. After Phineas convinces her to settle for it by yelling at her, the group is set.
They pedal with every ounce of their might down the street and into a ramp at the worksite. The jump over the ditch is perilous, but they make it safely back into the backyard just in time for the sun to disappear behind the horizon. They celebrate their amazing and remarkable success just as Linda and Lawrence arrive home weary from their weekend journey. They let Candace know how proud they are for having been so responsible but are unaware of what she and her brothers have gone through all day. They notice the welcoming party that has been set up but ate too exhausted to participate and turns in early, leaving the kids alone to enjoy it.
The group sings and dances to a celebratory musical number with Phineas, Ferb, Isabella, and Candace as the lead singers. As Candace finishes with her solo, she sees Jeremy entering the backyard and runs to welcome him. After telling her he returned from Paris as early as possible so he could spend time with her, he kisses her. As the musical number comes to a close, it occurs to Phineas now that Perry is absent and he wonders aloud where he is. Unbeknownst to him, Perry is in Paris, and at the moment, ordering at a restaurant with a date, apparently.
- "I Believe We Can"
- "J-Pop (Welcome to Tokyo)"
- "Rubber Bands, Rubber Balls"
- "Bouncin' Around the World"
- "City of Love"
- "Follow the Sun"
- "Summer Belongs to You"
- "The Ballad of Klimpaloon" performed by Love Handel (soundtrack only)
- "You're Wrong" (cut)
- At the beginning of the episode, Phineas comes up with a way to make the longest day of the year, and says, "Ferb, I know what we're gonna do today," but they don't travel the world until the next day. However, it could be possible that the thing they were going to do that day was to build the Sun-Beater 3000.
- At the beginning, when Candace was talking to Stacy in their kitchen about her love for Jeremy, the sky was changing colors out the window.
- Phineas says they have 40 hours of daylight. They depart Danville, westbound, early Saturday morning shortly after 5:00 AM. This would place their observed sundown after 9:00 PM the next evening, Sunday. This could include the morning light before they depart.
- While Milly is behind Isabella, her eyes are green instead of blue. Later on, her eyes are blue again, but turn brown when the man says "Mine was the one with the unusually large front wheel." After that, they're blue again. Also, during the man's dialogue, Katie's eyes also turn blue for a second and are green again later on.
- Buford said he was not a bully until his goldfish Biff was threatened as revealed in "Voyage to the Bottom of Buford" and mentioned in "The Lemonade Stand", which does not explain why he stole bikes when he was a toddler. However, he was a toddler so he probably didn't know better.
- When Candace was trying to talk to the French woman and she was holding the English to French, the picture was Britain Flag and France Flag.
- When Phineas was a toddler, his bike was blue, but later in the episode, his bike is red. However, this could be explained if Buford painted the bike red.
- During certain parts of "Summer Belongs to You", Adyson's hair is black instead of brown.
- In "Bouncin' Around The World", when the Sun-Beater 3000 is in Russia, a post sign says "ОСТОРОЖНО! ВЫСОКОЕ НАПРЕЖЕНИЕ", which is misspelled. The correct phrase would be "ОСТОРОЖНО! ВЫСОКОЕ НАПРЯЖЕНИЕ", meaning "WARNING! HIGH VOLTAGE".
- The kids and Candace have had their bikes in earlier episodes before. However, this could be explained if they bought new ones.
- After Chaka Khan makes her entrance in "I Believe We Can", Ferb's bigger eye is in the front of his face, while his smaller eye is behind it, where normally, the smaller eye would be in the front.
- When Clay Aiken and Chaka Khan fixed the Sun-Beater 3000, they used all of the packing tape. When Candace sees what the gang are doing, the tape is gone and is not seen again.
- Ferb drives the Sun-Beater 3000 toward the sunrise, meaning they fly to the East but the route on the giant map shows that they go to Tokyo first and across the Pacific Ocean, meaning they fly to the West and the sun is rising in the West.
- At the beginning, when Candace and Stacy walk through the back door of the house, Candace rips through Ferb's map, making a gigantic tear, almost completely ripping it; but when they are stranded on the island, Ferb's map has no tear in it at all.
- Before the wing fell off the plane, Phineas, Ferb, Buford, Baljeet, the Fireside Girls, Clay Aiken, Chaka Khan and the neighborhood kids were on the wing. When the wing fell off the plane, no neighborhood kids were seen on the plane. Adyson also disappears.
- When Major Monogram was coming up on the conveyor belt and Doofenshmirtz says, "Oh, here's my bag now," Monogram was tied to a blue pull cart, but as soon as Doofenshmirtz picks him up and the scene zooms out, he was tied to a red cart. Later in the Tokyo Tower, he was tied to a blue cart again.
- If Major Monogram was 35% metal like he said, he would never have been able to be a "bag" (also the fact that he is a person tied up). Doofenshmirtz even said, "Oh man, it must be hard getting through the airport".
- While flying over the Pacific Ocean, Baljeet wasn't seen in his seat.
- When the gang arrived in Tokyo, Isabella's bow plus her and Candace's hair are messed up. When the Sun-Beater 3000 gets on its wheels, their hair plus Isabella's bow are fixed, but when Phineas says he though it sounded grind and spark, their hair plus Isabella's bow are messed up again.
- After "J-Pop (Welcome to Tokyo)", Phineas tells Candace that Tokyo was a fun town, but Tokyo is actually a city.
- Candace's socks appear on Isabella and Isabella's socks appear on Candace during "Bouncin' Around The World". In the same song, the seats and rubber-bands of the Sun-Beater 3000 aren't colored in.
- When Isabella and Phineas approached the fountain in "City of Love", Isabella was suddenly smiling, but in the next shot she was sad again.
- When Doofenshmirtz says, "According to this SPG..." at first it is right side up. But when it zooms in on him is when it is actually upside down.
- Buford's death sign is wrong. Because in real life, it would be with the thumb towards the neck.
- In the song "City of Love", Phineas and Isabella were under the Eiffel Tower in the second verse, but Ferb was still on the scooter with Vanessa on his following line. That would mean Phineas and Isabella made it to the Eiffel Tower on foot faster than Ferb and Vanessa with the scooter. However, this could be explained if Ferb and Vanessa went to other places before going to the Eiffel Tower.
- The sailors claim there were 5 kids on the boat, but there were 6: Phineas, Ferb, Candace, Isabella, Buford, and Baljeet. (Although, he probably didn't count Candace, seeing as she's a teen).
- Phineas (and later, Isabella) mentioned time traveling twice. However, at the end of "Phineas and Ferb's Quantum Boogaloo," Isabella's meddling with the time machine causes the trip to the future taken at the beginning of the episode to have never occurred, so technically, they only time traveled once.
- When Phineas says to Candace "Yeah but we still have this rubber band made with super special density" he was missing a stripe from his shirt.
- The "Big fat ox" that's on the island is a musk ox. Musk oxen are native to Arctic regions and would never be found on an island in the Atlantic especially since there is palm trees on the island which is usually native to tropical regions.
- The pronunciation of Chaka Khan is messed up at the end when they were telling Candace about it.
- Towards the end Isabella is shown wearing a watch although it did not appear in the rest of the episode.
- Isabella says there's 58 seconds until sundown, but the time between when she said that and when they get to Phineas' backyard is 87 seconds in real life time.
- During the song "Summer Belongs to You", there are a lot of mistakes regarding placement of objects and characters. For example, during the song, Buford pushes the roller-coaster car up to the stage. Phineas and Isabella jump out and go to the mics. Ferb is still in the car. Phineas goes to the second microphone, and Isabella goes to the third. They sing the beginning of the chorus, "Summer Belongs to You!". However, in the very next frame, Phineas is at the first microphone, Isabella is at the second, and Ferb suddenly appears from nowhere on stage at the third.
- During the song "Summer Belongs to You", Isabella's tambourine turns invisible for one frame.
- During the song "Summer Belongs to You", Isabella's hair becomes shorter for a second.
- At the big cast shot at the end of "Summer Belongs To You", Pedro appears twice, one at the bottom left and one and the top left.
- In this episode, Candace says that she didn't have international coverage on her cell phone, but in "A Hard Day's Knight", she is calling Stacy from England.
- When the Sun-Beater 3000 crash lands in Paris, Isabella and Vanessa are not seen in the plane.
- After Ferb shows everyone the map on the island, Phineas says that they only have 11 minutes, but the Mid-Atlantic is 3 hours ahead of America, so that meant they actually had 3 hours.
- Buford said that the Pacific Ocean is his 5th favorite ocean. There are only four oceans, not five. However, he might have been referring to the fact that some think that there is a fifth ocean (Southern Ocean), though it is likely implying that he has low intelligence.
- The camera points at the sunset when Isabella is talking to Ferb about it on the island, but the sun is actually rising.
- When Doofenshmirtz is holding his GPS upside-down, he says 'According to this SPG...' If the letters GPS were turned upside-down, they would look nothing like SPG. The same applies with Paris and 'Sirap'.
- In the morning, Phineas mentions that it's the Summer Solstice. However, the day before that he said that summer was almost over. Since the Summer Solstice is in June, summer should have just started, though this could have been a figure of speech.
- During the first verse of "Summer Belongs To You!", when Phineas and Isabella are switching places, the color of the sole of Phineas' right shoe and Isabella's left shoe becomes transparent.
- Shortly before crash-landing in Danville, Ferb is shown holding a steering wheel, which was lost when they were traveling across the Atlantic Ocean.
- When Buford and Baljeet are loading the snail oil into the plane, the keg's funnel was inside the giant baguette. But the baguette was simply rubber-banded on for buoyancy.
- In one scene, Candance's hair is messed up (because of pigeons under the bridge in Paris) and is without a life jacket. But when the plane takes off, her hair is in its normal state and she has a yellow-ish life jacket.
- Paris is actually called the City of Light, not the City of Love.
- This episode marks the first and only 1-hour episode using Walt Disney Television and Disney Channel Original logos after the end credits.
- This is the first one hour special episode of Phineas and Ferb.
- The episode is based on the novel Around the World in Eighty Days, as Buford bets that Phineas and Ferb can't fly around the entire world in just 40 hours. Also, Isabella is trying to show her affection to Phineas the same way as Aouda tries to with Phileas Fogg, also implying that maybe Phineas will only realize his feelings for her after she admits it first.
- Phineas, Ferb, and their friends go up a ramp and appear to fly on bikes, a reference to the famous scene in E.T..
- The jump-roping robot's statements "I jump, therefore I am" and "I dangle, therefore I am" parody René Descartes's famous philosophical statement, "Cogito, ergo sum" (I think, therefore I am).
- The anime-inspired dance sequence in Tokyo parodies a popular internet meme turned music video, "Caramelldansen". The final scene of the sequence, where Isabella is shaking a leek, parodies "Loituma Girl" (aka "Leekspin"). Both scenes involved an anime character looped to a short music clip.
- The revelation tarps resemble famous statues. The one hiding the plane is the Statue of Liberty, and the one hiding the diorama is Discobolus.
- Isabella's line "We'll always have giant plastic baguettes" parodies "We'll always have Paris," a famous line from the classic film Casablanca.
- While stranded on a desert island, Phineas finds a square yellow kitchen sponge and a pink starfish, and says "Look! A sponge and a starfish! There's gotta be something we can make out of this! No, that's ridiculous." which is most likely a friendly jab/reference to its arch-rival animated series SpongeBob SquarePants. Dan Povenmire worked on the show before developing Phineas and Ferb.
- During the song "Summer Belongs to You," Phineas says to Candace, "By Jove, I think she's got it!" This is an exact quote from the famous musical My Fair Lady.
- Baljeet and Buford share the same strand of spaghetti and nearly kiss, parodying an iconic scene in Lady and the Tramp during the song "Bella Notte".
- Assuming that Phineas' estimate of "sixteen hours of daylight" is accurate, this places Danville at about the 48th parallel.
- It is revealed that Buford can speak French fluently with a French accent. He has also read Voltaire well enough to quote his works. Between these facts and his line "Oh, I can't help it, Paris does it to me every time," it is hinted he may have been in Paris before.
- Buford confirms this idea in the later episode "Buford Confidential".
- "Poubelle" is the French word for "trash can". Therefore, the hotel Jeremy is staying at is called "Hotel Trash Can".
- The fourth wall is broken several times:
- Phineas breaks the Fourth wall when he says "No matter where we go Ferb knows everyone" because he looks straight at the camera.
- Phineas breaks the fourth wall when an ad appears over the triangle that Ferb was holding by saying "Hey! Do you mind? We've got a visual gag going on here! Thank you!"
- The summer solstice is the first day of summer. Therefore most of the kids' summer adventures happened before summer.
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