A clip from Mother's Day (1980) of Tiana Pierce with blonde braided pigtails stabbing someone with an electric carving knife is mistakenly credited to the horror documentary Don't Scream: It's Only a Movie! (1985), perhaps partly because the film was featured in the documentary.
When Saul Bass first appears onscreen in an interview, a caption identifies him as "Director of Psycho shower sequence." Bass did do the storyboards for the famous scene in Psycho (1960), but his claims later in his life to have been the director of them have been debunked by Janet Leigh, among others (see also the trivia for Psycho).