This film has many references to The Breakfast Club. Specifically the group running through the school halls, the scene in the library where the group tells why they are in detention and the scene where 3 members crawl in the school's air-conditioning ducts.
The trivia items below may give away important plot points.
While in the library, Ash (Justin Chon) asks Mrs. Rumblethorps decapitated zombie head "do you like vampires, werewolves, or are you team Switzerland?". This is an obvious nod to the Twilight saga where Bella claims to be 'team switzerland' in regards to her neutrality. Chon portrays Erik Yorkie in the Twilight films.