When released in 1986 the title was changed from "The April Fools" to "Killer Party" because the distributors feared that it would be confused with the film April Fool's Day (1986) which was also released around that time.
The film suffered severe cuts by the MPAA. As a result, most of the murders occur off-camera and feature little to no gore or violence. Because of this, the filmmakers edited the film in such a way in that the murders seem to happen immediately after each other in quick succession. When the film was originally shot, more time had passed between each murder, which included special effects and on-screen violence. Ironically, the promotional material released feature several shots of the excised deaths, including an image of Pam (Deborah Hancock) getting skewered by the trident.
Shot in October. While the first half of the film takes place at the beginning of the school year in autumn, the second half of the film is supposed to take place in the spring (specifically April 1) and includes scenes of actors bundled in winter coats and even snowflakes passing by the camera during exterior shots.