When Penn discovers that Phyllis is trying to locate the Most Dangerous World Imaginable to bring his parents back to Middleburg, he takes matters into his own hands leading to catastrophic results, zapping him to the Least Dangerous World Imaginable.
- This is the second "tent pole" of four important double-length episodes that "dig a bit deeper and tell a bigger story," of the first season, the first being "North Pole Down".
- It is revealed that Phyllis has been working on finding the Most Dangerous World Imaginable in order to save Penn's parents.
- Boone reveals that he is the only one out of the three heroes that Phyllis considers responsible enough to have a key to the Odyssey.
- When the heroes try to use the MUT without Phyllis, Penn discovers that it is possible to go into another dimension with the MUT without zapping into someone else's body.
- This is the first episode where Penn doesn't zap into someone else's body.
- Penn is the first character to get fired from his part-time job, and get re-hired in the same episode.
- The Zero family name is revealed to come from the fact that the Zeroes have never failed a mission.
- Penn unofficially applies to become a part-time villain, though he is doing it to get back into the Least Dangerous World Imaginable and fix things.
- Penn uses the villain's portal in Fish Stick on a Stick, making him the first hero to use it.
- Phil gets one in "The Ripple Effect", where he hires Penn as a part-time villain, allowing him to use the villain's portal to enter TLDWI and save everyone.
- The process of becoming a part-time hero or part-time villain includes a job interview.
- According to Sam Levine, the process also involves signing something.
- When Penn is captured by Cuteling Citizens and restrain him on ropes is reference to Jack Black's film Gulliver's Travels.
- A "ripple effect" refers to a situation in which one action or event sets in motion a subsequent series of actions or events, as well as to the series of actions or events thus caused, just as the creation of one ripple in a liquid (as by dropping an object into it) sets other ripples in motion (as when those ripples strike against an object projecting from the liquid).