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Continuity mistake: When Claire is in the bath, paralysed from the drug Norman gave her, and the water is rushing in, her head changes position: At first, her head is below the waterline, and then it is above the waterline - then Norman slips and hits his head - and then her mouth, nose and eyes are below the waterline.

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Continuity mistake: When Claire hears her neighbour crying, she calls out to her, and the startled woman dashes off to the left, so Claire (of course) dashes off to the right, but, when we next see the neighbour, she is at the right.

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Continuity mistake: When Norman puts Claire, who is paralysed, into the bath, her right arm is underneath her, but as the water fills the tub, her arm comes free.

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Trivia: There are quite a few close-up scenes filmed through glass, on the floor, with the camera on the bottom side and the actors on the top side. For example, when Claire is paralysed, Norman bends down and talks to her before picking her up and carrying her upstairs - when they are downstairs, Claire is lying on glass with the camera filming her from below.

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Revealing mistake: After Claire and Norman drop their daughter off at school, that night, Norman is in bed with his laptop, typing, but not once do his fingers touch the space bar.

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Continuity mistake: At the end, Norman and Claire are in the truck, which smashed into the river. Norman has less blood on his face than in the next shot, where he has a lot.

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