The house, in Rye, NY, used in the movie was the boyhood home of John Jay, the first Chief Justice of the U.S. Supreme Court and a writer of the Federalist Papers. The movie makers got permission from the owners, who had inherited the home after the owner died, to use the house inside and out including the grounds. They hoped they would abuse the house in making a horror movie. They wanted the house, which was in poor shape, to be condemned so they could tear it down because it was so expensive to maintain. The production company restored the plumbing, the electric and other repairs so the crew could stay in it while the movie was being made. The repairs help save the house from the wrecking ball. The heirs ended up selling the property to the Westchester County Historical Society for $15 million dollars, the home was restored over the years and it is now part of the New York Historical Parks and Sites. It is also a National Historical Site.
Reportedly, it was planned for Maria Pechukas to be stripped totally nude or topless by the creatures in the last scene as she ran from them. Pechukas had no problem with the nudity, but Michael Lee wouldn't pay her the money she wanted to do it, so she kept her clothes on. She went on to appear nude in every film she made after this.
Executive producer Michael Lee came up with the idea for the Muck Men to make farting noises. The directors and the rest of the production crew hated it.
Well-known underground comic artist Richard Corben created the poster art and video box for this film.
This film started out as Twisted Souls. It finished production and was in the editing stage when creative and legal issues ensued. The financial backer then hired a new director/editor who cut out scenes already filmed and inserted newly shot footage several months later (on the same location but with different actors). The rumor that the film is composed of two completely unrelated and unfinished films is not true.