Plot hole: The police let Norman back to his house on the same night multiple murders happened. He is even allowed into the fruit cellar, where most of them happened. (01:38:25)
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: 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.
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