In 2001, Jeremy Davies was in preparations for a different independent film about Charles Manson. He made a tape for the filmmakers of himself playing Manson and the tape became a popular bootleg in the industry. CBS cast Davies and allowed him to rewrite his lines due to his performance in the tape.
In this "Helter Skelter" film, Manson is shown with an "X" mark on his forehead. In real life, Manson wore the Nazi Swastika tattoo on his forehead. During the trial, he carved the x to represent "his being x'd out of society". It wouldn't be until sometime later, he turned it into the swastika.
Mary Lynn Rajskub originally auditioned for one of the victims before she was cast as Lynette Fromme.