The Pet Girl of Sakurasou (TV)

Sorata's message ringtone is Alex Kidd's theme.

In episode 1 at about 10:19, the shop owner utters the words “Boys meet ambitious” while pointing to a statue. The shop owner was misquoting William Smith Clark, American professor of Botany and Zoology who founded the Sapporo Agricultural College in 1876 and was its first vice president. Clark taught there for 8 months before moving back to the US. He is famous in Japan for the deep impact he had on the students while teaching there and for his farewell speech on the day he left Japan which started with the words “Boys, be ambitious !”. Many statues of him (like the one in the episode) have been erected across Hokkaido prefecture to commemorate him and many of these statues have his famous parting words engraved at the base.

In Episode 5, the game that Kamiigusa Misaki wants to play with Shiina Mashiro, Kanda Sorata & Mitaka Jin is Samurai Spirits also known as Samurai Shodown. There is even a game clip showing Gen and Cham Cham.

In episode 6's end, for the episode 7 preview, Yuuko sings a little tune( "Dudun dun dudun, dudun dun dudun, Yuukooooo, kuru yoooo, Yuukoooo, Kurun da yo!") that ressembles the Terminator theme(especially Terminator 2, which has the same number of beats for the "dudun" part), with some slight modifications where she sings a higher pitch for the last "yo". She sings the "Dudun dun dudun" regurlarly for the jump cuts in the next episode.

In episode 7 around 4:12, while the mother of Sorata Kanda is explaining why his little sister Yuuko Kanda is there, the animation changes to puppets (stick and hand puppets) but the whole seen was a reference to Little Red Riding Hood.

In Episode 19, Kamiigusa Misaki is seen playing Fatal Fury 2 with Kanda Sorata in his room.