Carla Borelli originally agreed to do some nudity when she signed on to act in this film, but refused to do the nudity at the last minute, while this movie was being shot.
Sherry Steiner refused to do the sequence in which her blind woman character gets attacked by snakes in a swimming pool, so director William Girdler had to convince his sister Lynne Kelly to double for Steiner in that particular sequence.
The yellow Porsche driven by Chris Duncan (Nick Jolley) actually belonged to director William Girdler.
This film was titled "The Satan Spectrum" in earlier drafts of the script.
Snakes were shipped in from California for the sequence in which a blind woman gets attacked by snakes in a swimming pool.