Trivia: Servant × Service
- Actor Allusion: Indirect example in Episode 12, where the audience sees that one of Chihaya's cosplay outfits is the trademark white sundress of Menma from Anohana The Flower We Saw That Day — which happens to be the breakout role of Ai Kayano, Lucy's voice actress.
- Cultural Cross-Reference: Pinned on Hasebe's bedroom wall in episode 8 during his Nightmare Sequence is a painting of Taylor Swift's Speak Now album cover.
- Executive Veto: Takatsu originally wanted Kanon to have bunny-ear-shaped hair for Strong Family Resemblance. The editor vetoed it.
- Hey, It's That Voice!:
- Write What You Know: Karino Takatsu worked in a ward office before she became a mangaka.
- In the Omake of Volume 1 of the manga, the author revealed that the reason why Kenzou Momoi appears as a stuffed bunny is because she wanted a Series Mascot and a boss character and ended up combining both together!