Although Jean Jennings signed a release at the time stating that she was 23, she later admitted she was only 17.
Actor Steve Lincoln uses the alias Roderick Usher in the film's on-screen credits. Roderick Usher happens to be a character from the Edgar Allan Poe short story "The Fall of the House of Usher."
This film was based on a real-life story in which a young woman lived with a doctor for five or six years after he managed to have her taken out of a mental hospital.