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Revealing mistake: The bird that Mitch catches under his hat is fake and doesn't move. However, in the next shot when he takes it out from under his hat the bird is real. There are numerous instances throughout the film where it is obvious that the birds are fake. (00:06:15)

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Revealing mistake: As she speaks to the cashier, most of the birds perching in the cage behind and to the right of Melanie are fake. The perches sway but the birds don't move. (00:02:55)

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Revealing mistake: The glasses of the girl in the red sweater fall off as she calls for Cathy to help her. If you look closely the glasses are broken before they hit the ground and we hear the sound of them smashing. (01:14:40)

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Revealing mistake: As Melanie drives up to Bodega Bay the birds are supposed to lean as the car goes around corners but the mechanism for the bird on the right gets stuck and reacts slower than the bird on the left. (00:11:00)

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Revealing mistake: If you watch closely as she sets sail Melanie's boat nudges the boat that the camera is on causing the film to jiggle slightly as she passes by. (00:20:35)

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Revealing mistake: As the children start running down the hill from the school a girl in a white dress and blue sweater is cracking up. (01:13:35)

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