Psycho

Revealing mistake: When Marion is driving her car through the night, she keeps looking at her speedometer. You can clearly see that the gear shift lever is in "park" as she is driving.

Revealing mistake: After Marion has been murdered there is a close-up of her face. If you look down to her neck you can see her pulse.

Revealing mistake: After Marion's sister and boyfriend look through the Number 1 bathroom and find the ring on the toilet, they turn off the light. On the wall behind them you can make out a square beam of light, but no other lights are on in the cabin.

Revealing mistake: When Marion's boyfriend and sister visit the Sheriff and his wife at home, there is a camera shot where you can see that the living room background scenery ends and there is no ceiling.

Factual error: When Janet Leigh is shown lying dead on the floor of the shower, there is a close-up of her open eye. The pupil is contracted to a pinpoint (obviously due to the bright lighting) where it should have been dilated. After the film was released, Hitchcock heard from several ophthalmologists who pointed this out and suggested he use belladonna eyedrops in the eyes of "dead" people in future films, as the chemical prevents the pupils from contracting. (00:48:30)

More mistakes in Psycho

Norman Bates: A boy's best friend is his mother.

More quotes from Psycho

Trivia: Although it lasts for only 45 seconds on screen, the stabbing scene in the shower took seven days to shoot and used 70 different camera angles.

More trivia for Psycho

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