 For the film's special effects, which included multiple murder sequences by bludgeoning and stabbing, Sole hired friend William Lustig, who would later direct the cult horror film "Maniac" (1980).Lustig also worked as an assistant cameraman on the film.Dick Vorisek, who had previously worked on "Dog Day Afternoon" (1975) and "Carrie" (1976), was hired onto the film as chief sound engineer after Sole was put in contact with him through Technicolor.