Revealing mistake: At the end when Norman is being stabbed at by Mary dressed up as Mother, Mary stabs Norman in the hand. You can plainly tell that this hand is a doll, as it is not a natural colour, it is stiff and is stationary, unlike Norman who is moving his hands. (01:35:10)
Mary is really the daughter of Sam Loomis and Lila Crane from the first Psycho. Sam is dead, but Lila intends to make Norman go insane again by dressing up as his mother, and by calling him and pretending to be his mother. Eventually Norman does go insane again and kills Lila. Mary (not knowing what's happened to Lila) tries to dress up as his mother and convince him that it's all a lie, but Norman forces her down to the coal cellar, where Mary discovers Lila's body. Mary threatens to kill Norman, but as she does, the police break in and shoot her. Mary and Lila end up being blamed for the murders and Norman is set free. Later on he's visited by a woman called Miss Spool, the sister of Norma Bates, who claims to be Norman's real mother. He kills her with a shovel and takes her up to his mother's room, where she becomes his new "Mother".
Mary: You really wanna know what Norman's like?
Warren Toomey: Yeah.
Mary: Better than you'll ever be, fat boy.
Trivia: For the last murder scene, when Norman brains his mother with a shovel in the kitchen (the only murder Norman actually commits in the entire film), his mother turns into a life-size dummy just before the fatal blow. You notice that she inexplicably leans far forward and bows her head (to hide her face for the dummy transition) just before Norman hammers her. This scene took several days to shoot, to get the transition just perfect, and it is the best practical special effect in the movie.
Question: Spoiler alert: this question gives away much of the first "Psycho" movie. In the original Alfred Hitchcock "Psycho" we witness Norman Bates murdering Janet Leigh/Marion Crane and Martin Balsam/Milton Arbogast, and very narrowly missing killing Vera Miles/Lila Crane. At the end of the movie we discover that Norman Bates had murdered his mother and her lover ten years previously. We are also told that he had killed two female guests at Bates Motel. Norman Bates is therefore guilty of six murders and one attempted murder. In Psycho II we find out that, after his crimes were discovered, Norman Bates was placed in a secure psychiatric institution for the criminally insane. This does seem plausible. But with such a criminal record, would he ever be released from incarceration?
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