Trivia: The last assignment Christopher Walken gives his students before his accident is to read about the headless demon in the story "The Legend of Sleepy Hollow." Years later he played the Headless Horseman in the movie "Sleepy Hollow."
Trivia: Some of the campers seen getting off the buses at the beginning of the film are relatives of the cast and crew.
Trivia: When Arnie and Leigh discover that the car has been trashed at Darnell's Garage and Arnie suddenly turns on Leigh, yelling at her and shoving her backwards, note the look of shock on her face - it's real. Keith Gordon (Arnie) explains on the DVD that in rehearsing the scene, he purposely didn't react as violently, so when the scene was shot, his behavior change actually shocked Alexandra Paul (Leigh). (00:57:20)
Trivia: When Mary and Norman go into Mother's room, before Mary turns on the light look at the shadow on the wall on the right. It is a silhouette of Alfred Hitchcock, the director of the original "Psycho" (1960). (00:24:10)
Trivia: The deformed, mentally challenged killer, masked too with a mean overly protective mother seems to have taken inspiration from the first 2 Friday the 13th movies.
Trivia: This was David Niven's final film. He was so ill during production that his lines throughout most of the movie had to be overdubbed by impersonator Rich Little.