Amagami SS (TV)

The names of the other members of the Tea Club are similar to names of characters the seiyu play in another dating sim game, Kimikiss pure rouge. the seiyu for Manaka Hiba also played Manami Hiba, and the seiyu for Ruriko Yuzuki played Kaoruko Yuzuki in the other series.

In Episode 3, Junichi is looking at the guys, trying to built a giant mecha for the upcoming school festival, the mecha's leg was part of Mobile Suit Gundam

In episode 12 when Sae-chan is bouncing around on the bed in a penguin costume, you can see that the costume has a baby. This is a reference to the original game, which has a CG of Sae-chan pregnant.

In Episode 12, at the Guy's Restroom, there's a english-speaking foreign Director talking to Junichi, he looks like the famous American Film Director, Steven Spielberg

In Episode 14, Ai Nanasaki is wearing an Action-belt, doing a tranformation pose of any Kamen Rider series

In episode 14, the library assistant that Junichi, Kaoru, Ai, and Masayoshi speak to shortly after the opening credits is clearly modeled off of the character Touko Amano from the Book Girl (Bungaku Shoujo) series of light novels and anime. Indeed, the unnamed girl shares Touko's voice and is referred to by Masayoshi shortly thereafter as a "bungaku shoujo."

In Episode 16, at 0:10~0:11 & 10:11~10:23, the guys finished the mecha they developed for the Founders Festival, the mecha is a parody of a mobile suit from the anime "Mobile Suit Gundam" and other mecha anime's, along with the the mecha's head crests looks like from Ingram from the mecha anime "Mobile Police Patlabor", the mecha's shoulder are from RGM-79G GM Command from the mecha anime "Mobile Suit Gundam 0080 : War in the Pocket", the mecha's squared head are from RX-79(G) Ez8 from "Mobile Suit Gundam 08th MS Team" and the mecha's main camera housing can also be seen in all Gundam mecha's

In Episode 22, at 9:12, Tsukasa painted the entire mecha parody of "Mobile Suit Gundam", including the mecha's leg and the scribble which Haruka Morishima made.