- Mandy Moore as Rapunzel
- Zachary Levi as Eugene Fitzherbert
- Clancy Brown as King Frederic
- Julie Bowen as Queen Arianna
- Bradley Whitford as King Trevor
- James Monroe Iglehart as Lance Strongbow
- Jeremy Jordan as Varian
- Vivian Vencer as Angry/Kiera
- Paul F. Tompkins as Shorty
- Steve Blum as Attila
- Charles Harlford as Vladimir
- The serpent, which was portrayed in Corona's map from the credits of Tangled, appears in this episode.
- King Trevor's Navy Seals is a nod to the special operations force of the United States Navy.
- The title references the King of Hearts and the Queen of Hearts.
- It's revealed that Queen Arianna has a thirst for adventure, and King Frederic likes collecting eggs.
- This is the second episode that takes place during the annual Day of Hearts celebration, the first being "Under Raps".
- It's revealed that King Frederic is unable to swim.
- Herz Der Sonne's journal is destroyed in this episode.
- It's revealed that Maximus's copy of the Corona law book still has the dagger stabbed on the cover since the events of "Max and Eugene in Peril on the High Seas".
- There are a few scenes that are references to the film, Tangled.
- Rapunzel's line "Garcon, your finest table, please." is a reference to Eugene's line when he brings her to The Snuggly Duckling.
- During King Frederic and Queen Arianna's date out on the lake, Eugene makes a reference to his and Rapunzel's first date in "I See the Light".
- Rapunzel knocking out King Trevor and tying him up in her hair is a reference to her actions when she first met Eugene.
- It's revealed that King Frederic and Queen Arianna still have amnesia after their memories were erased in "Rapunzel's Return", and Varian has since been trying to find a cure to restore them.
- By the end of the episode, their memories slowly begin to return after they witness the love between Rapunzel and Eugene.
- It's revealed that Rapunzel and Eugene still have yet to write their names in Herz Der Sonne's journal which becomes a running gag throughout the episode as Eugene expresses his wish for them to sign the book together.
- By the end of the episode, after Rapunzel creates a new Book of Hearts, she and Eugene are the first to sign their names.
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