Simon Pegg and Nick Frost made the film to demonstrate their love for Steven Spielberg's science fiction classics Close Encounters of the Third Kind (1977) and E.T. the Extra-Terrestrial (1982). When Spielberg got wind of the project,《天台上的男生》金银花露 he happily suggested that he make a cameo appearance of some sort, in this case a voice on a speakerphone.