While admiring the merchandise in Animate, Animate's mascot "Meito Anizawa" also known as "Anime Tenchou" can be seen behind Nagi on a product in the backround.
While sneaking into the R-18 section of the store, Nagi drops a Nendoroid figure of Louise from the series Zero no Tsukaima.
As Hayate learned that the Mobile Battleship Nadecata Blu-ray was sold out, a character heavily resembling Char Aznable from Mobile Suit Gundam can be seen on the lower right corner of the sold out sign.
While watching the Blu-ray of Mobile Battleship Nadecata at the Sanzenin Mansion, Chiharu brings up the character RuriRuri while arguing with Nagi. This is a reference to the character Ruri Hoshino from the series Mobile Battleship Nadesico.