Trivia / My Little Pony: Friendship Is Magic S3 E13 "Magical Mystery Cure"

• Ascended Fanon: Although "Magic Duel" earlier in Season 3 featured the Alicorn Amulet (the first canon use of the term "alicorn" in the series), this episode is the first place in the series where the word is explicitly used to describe a winged unicorn.
• Executive Meddling: M.A. Larson wanted this episode to be a two-parter to expand the swapped cutie mark storyline, but the higher-ups told him no.
• Milestone Celebration: This episode, along with Equestria Girls, was released during the 30th anniversary of the My Little Pony franchise.
• What Could Have Been: M.A. Larson's final draft for the episode was quite different before it was edited into the version seen now. Instead of Star Swirl's journal, Princess Celestia sends Twilight a crate containing immense magic power as part of her next level of study, instructing Twilight not to open it without her à la Pandora's Box. Unable to help herself, Twilight gives into curiosity and opens it, the cutie mark swap occurs, and not even Celestia can do anything about it except tell Twilight, "What have you done?" By reversing the spell and doing something Celestia (instead of Star Swirl) could not, Twilight would earn her wings and title as princess. The episode was also written to be the Grand Finale, since at the time it was uncertain if the show would get a fourth season.
  • An early version of Celestia's Ballad has the astral plane referred to as "Caelum"—which is Latin for "Heaven".