Trivia: In the scene where Alice finds Bill's body hanging on the back of the door to the generator room, the producers purposely did not tell Adrianne King what they were going to do to the body nor did they let her see the body beforehand. When she saw the body during filming it was for the first time. The scream she produced was genuine as it scared her badly. Needless to say, that entire scene was shot in one take.
Trivia: Betsy Palmer was never originally considered for the role. Shelly Winters was the first choice, but was not interested. Betsy Palmer ultimately took the role because she needed money for a new car, as hers broke down as she was traveling back home to Connecticut from New York.
Trivia: According to producer/director Sean Cunningham, Shelly Winters was the original choice for Mrs. Voorhees. He wanted a known actress whose career was winding down so the fee would be low. Winters wasn't interested. Estelle Parsons actually negotiated to be in the film, but ultimately backed out. Louise Lasser and Dorothy Malone were also considered before they finally would up with Betsy Palmer, who famously agreed to the role because she needed the money for a new car.