Shot in 1975. The material was considered so controversial that none of the major CBS sponsors wanted to run their ads during the movie, so it languished on the shelf for nearly a year.
Mentioned in the movie "Experimenter" in 2015, and shows an insight of the film and the agentic state that can be understood by reading Stanley Milgram's book "Obedience to Authority."
There's a rumor which says that [John Travolta] made an uncredited appearance in the movie. Actually, is unconfirmed if he appears in the movie, because in the different sites that you can read it, one says that he plays a College Student and other says that he plays a Lab Technician, and all of them always refer to different men which is impossible to affirm if they're Travolta or any other.
William Shatner's face in this movie was the basis for Micheal Meyers mask in the movie Halloween (1978)