The first Persona that Makoto summons in the movie is Oberon, whose origins come from Shakespeare's 'A Midsummer Night's Dream'.
During the Summer Festival, five masks from Phoenix Ranger Featherman R (the game's version of Power Rangers) can be seen on display.
Characters from the game make appearances in the movie.
Mamoru Hayase is present in a kendo tournament.
Ryoji Mochizuki appears in a post-credits scene.
Cameo: Noriko Kashiwagi, a teacher from Persona 4, makes a cameo appearance when the group goes to Yakushima.
The scene where Ken first awakens to his Persona, in July, is similar to Spring of Birth where Yukari drops her Evoker and Makoto takes hers to summon his Persona.