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Deliberate mistake: Mitch carries Annie's body into her house through the front door, which he doesn't close behind him. In the next shot as he leaves the house it's been closed and he has to open it before he walks out. (01:32:20)

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Deliberate mistake: Some of the children that are running in front of the superimposed background were never in the classroom. For example the blonde girl in the blue and white sweater in the middle of the second shot and the girl in the green sweater in the center of the third shot were not there. (01:13:40)

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Deliberate mistake: The fake dried blood on Melanie's forehead comes off too quickly and totally with the dry Kleenex that she uses. (00:27:10)

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Deliberate mistake: When Melanie first walks into the classroom she sees five rows of students. Later when the students are about to leave there are only four rows of students, now ending with the boy in the plaid shirt (closest to the camera), in the front. The row on the left has been removed so the camera can pan from left to right in the side shot. (01:08:50 - 01:13:00)

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Deliberate mistake: It's supposed to be a moonlit night when Melanie walks into the bedroom. But when we see the opening where the birds got in there's a blue sky much brighter than it would actually be on such a night. (01:48:35)

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Deliberate mistake: The dummy consumed in the fireball is much shorter than the actor it doubles for. (01:25:30)

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