During an interview with Ben Mankiewicz on TCM, Roger Corman stated that whilst the film's title was originally "Dementia", he discovered that there was another film by the same name, Dementia (1955), so he wanted to alter it. He thought to himself that the number 13 was typically thought of as a scary number, and "Dementia 13" sounded good. He called up Francis Ford Coppola and asked if he could add something to the script about a character having something bad happen to him at the age of 13 that would influence him to become a killer later on in his life. This would justify the addition of the number. Coppola agreed to do this.

Film

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