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Deliberate mistake: Det. Kinderman appears between shots sitting on the bleachers as Father Karras is out for his early morning jog around the track. (01:03:00)

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Deliberate mistake: As the alien ship attacks and destroys the bomber with it's ray gun we see stock footage of a different WWII bomber being destroyed by the German Air Force. (00:57:15)

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Deliberate mistake: After the alien ship destroys the bomber, Dr. Marvin picks up the helmet and they all start to run back to the car. In order to save time in repositioning the camera they start out 50 feet behind where they just were in the previous sequence and run back to the exact same spot. (00:57:50)

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Deliberate mistake: As the alien spaceship attacks a bomber we see it superimposed through the windshield. The pilots never react because they're not actually seeing it and are poorly directed. (00:57:10)

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Deliberate mistake: As the Marvin's approach "Operation Sky Hook" they hear the UFO above. Out the rear view window we can see the same sign and background they passed several minutes ago when the doctor started making his tape recording. (00:05:15)

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Deliberate mistake: Hollis Mulwray walks out to the ocean and it's obviously sunset. In the next shot we see Jake's face up close and it's obviously mid-afternoon. (00:11:05)

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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: After Hubert exit's the French Plantation dinner scene the stage lighting on Roxanne and Captain Willard shuts down abruptly before their close-ups. There's no one there to touch a light switch and we can see outside and the natural lighting hasn't changed. (02:13:30)

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Deliberate mistake: None of the helicopter's in the movie have the Army markings seen on Vietnam era Hueys. The most you'll see is some crooked, faint and inaccurate stencils in the wrong spots. (00:37:50 - 00:51:25)

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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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Deliberate mistake: When Michael Douglas pretends to be hurt in the field, Glenn Close says, "You bastard," and her hair is not in the sunlight. In the very next shot it is. (00:27:00)

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Deliberate mistake: Jean Peters' face is dry on the Maid of the Mist boat ride. (00:12:00)

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