Right after principal shooting for Four of the Apocalypse was complete, director Lucio Fulci began working on a new comedy film the vein of Mel Brooks' Young Frankenstein. The film's screenplay included the comedy screenwriting team of Bruno Corbucci and Mario Amendola as well as Pupi Avati. Fulci has stated that Avati's contribution to the screenplay was only a few pages, specifically the trip to Romania, but not the trip to the night club. The dialogue in the film was revised to make it more spontaneous by Enzo Jannacci and Giuseppe Viola.
