Ian Sinclair's version of the Narrator in the English Dub is significantly different than the Original Japanese's version, voiced by Yutaka Aoyama. Aoyama plays the Narrator Straight, as if studying the Characters in the same vein as a Documentary, while Sinclair is more playful, cracking jokes & laughing (most likely Improvisation on Sinclair's part).
The Scene at the very end of Chika's character song at the end of Episode 3, where Chika releases a small bug back into the Wild, is based on a Manga Chapter that wasn't adapted in the Anime, in which Shirogane attempts to hide his fear of the Bug from Kaguya; in the end, Chika gets praise for "her Bravery" from Shirogane when she releases the Bug for him.
A large portion of the Opening sequence & the Marketing focuses on Old Maid playing Card; however, Chapter 2, the Chapter in which they play Old Maid, never made it into the Anime.
Shortly after the Third Season Aired, the Series briefly took the Top Spot on MyAnimeList's Popularity Poll with a Record Breaking 9.15 approval Rating, taking the Spot usually held by Fullmetal Alchemist: Brotherhood.
The Mass Media Club Members, Karen & Erika, are the stars of their own Spin-Off Manga, in which the 2 come up with Absurd Theories of what happens behind the Student Council's Doors. Often the Stories take place concurrently with the Main Series Story & Sometimes Intersect in Humorous Ways.