Star Paula E. Sheppard, who played 12-year-old Alice, was about 19 years of age during the making of the movie.
Debut cinema movie of actress Brooke Shields who played Karen Spages. The picture marked her first performance in a theatrically released feature film according to an article published in 'The Los Angeles Times' newspaper on 12th May 1978.
Alphonso DeNoble, who played the Spages' fat pervert landlord, wasn't a professional actor at the time. He was working as a bouncer at a bar and director Alfred Sole persuaded him to play the role. Before his death in 1978, he got acting jobs in two other low-budget horror films.
This film takes place in the early 1960s. In one scene a photo of President John F. Kennedy is shown hanging on a wall, and a 1961 calendar is shown in the detective squad-room.
The Columbia Pictures studio was set to release the movie under the title of "Communion" but allegedly pulled out for legal reasons. When Allied Artists Pictures picked it up for distribution in the U.S.A and Canada, director Alfred Sole demanded a title change so that the audience wouldn't think it was seeing a religious film. The novelization retains the film's original title of ''Communion''.