- Approval of God: As far as Kinoko Nasu is concerned, Prisma Illya IS the "Illya Route."
- Banned in China: Russia banned Prisma Illya because they considered it child pornography.
- Fan Nickname: Rather than its full title, the series is typically referred to as just "Prisma," "Prisma Illya" or even "Prillya" for convenience. Despite the franchise's traditional naming convention, you'd have trouble finding anyone who just called it "Fate/kaleid."
- Marth Debuted in "Smash Bros.": Caren Ortensia makes her international debut as the sadistic nurse at Illya's school.
- Newbie Boom: Fans of the main series who had written off Prisma as just a parody or outright lolicon bait were quick to find new interest in it following The Reveal that Miyu's brother is an alternate Shirou Emiya who took a path similar to Heaven's Feel to protect his little sister. Even moreso after the flashback arc that tells his story was adopted as a standalone film that can be reasonably watched without much knowledge of the main series.
- The Other Darrin: An unusual change of pace from Sentai Filmworks. Instead of outsourcing the dub to Bang Zoom! Entertainmentnote , they decided to use their in-house studio. This caused many of the original voice actors from the original Fate series to not reprise their old roles.
- An interesting case with the fourth season, due to Miyu Matsuki's passing, they obviously had to recast Sapphire, so who replaces Miyu Miyu? Yumi Kakazu who voiced Hisui in JC Staff's much reviled anime adaptation of Tsukihime which still retains the joke that Ruby & Sapphire are supposed to be Kohaku & Hisui
- Portmanteau Series Nickname: Sometimes referred to by the author and other sources as "Prillya."
- Promoted Fanboy: The manga's author and illustrator, Hiroshi Hiroyama, created several parody Doujinshi works based on Fate/stay night and Fate/hollow ataraxia before beginning work on Prisma Illya.
Trivia / Fate/kaleid liner PRISMA☆ILLYA