References to the gangster films of Joe Shishido abound, as well as to the videos of Michael Jackson. The inspiration for the fly-man and the "toumei ningen" (transparent man) may have been a 1957 horror movie directed by Mitsuo Murayama, called "Transparent Man & Fly-Man" (透明人間と蝿男). The manner in which the "fly man" is formed is directly taken from David Cronenberg's 1986 remake of "The Fly", so the gag is also at least partially based on the Hollywood film. Hunting suits worn by the Doctor and his assistant are a reference to Ivan Reitman's 1984 SF-comedy "Ghostbusters". The alternative ending, which comes after the end credits, features the familiar reference to Steven Spielberg "E.T.", the character flying by the moon.