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Continuity mistake: The building manager says, "Oh, an actor. We're very popular with actors," as they approach the door to The Dakota. In the next shot when Guy responds they're already about four or five feet through the doorway at the steps. (00:02:25)

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Continuity mistake: Rosemary and Guy walk into The Dakota and from the overhead shot we see the guard standing on the curb to left of the entrance. In the next shot of them inside the entranceway the guard is now inside the tunnel with them. (00:02:00)

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Deliberate mistake: Two trucks with magnetic interference units on them are shot at by the aliens and the exact same sequence is used again three shots later as they shoot at them again. (01:18:35)

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Continuity mistake: When Damien jumps through Regan's window we can see that half of the window frame is still there. But a couple of shots later when Det. Kinderman looks through it almost all the window is knocked out. (02:01:40)

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Audio problem: At the end of the movie Chris calls to Father Dyer from her car and says, "I thought you'd like to keep this". If you read her lips she just says, "I thought you'd like this". (02:05:25)

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Visible crew/equipment: In the final battle an alien spaceship rips apart the Washington Monument and if you look closely you can see cracks in the spot where it eventually breaks apart before we see it happen. (01:18:20)

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Continuity mistake: At the end of the movie Chris calls to Father Dyer from her car and a Volkswagen beetle appears parked in front of them on the right side of the road, even though we've heard no car passing them. (02:05:45)

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Continuity mistake: As Dr. Marvin tries on the alien helmet the microphone on the table that Carol spoke into when they demonstrated the alien translating device is standing straight up. In the next shot it's moved sideways. (01:02:45)

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Visible crew/equipment: As the saucer lands on the White House lawn a truck with the magnetic interference unit on it pulls up and you can see the reflection of the crew in the shiny driver's side door. (01:15:35)

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Visible crew/equipment: The general gets a phone call just as Carol gets ready to leave his office at the Pentagon and he tells her, "You better get down to the shelter". As he says this the camera zooms in and it's shadow can be seen on his desk. (01:12:00)

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Continuity mistake: One of the three trucks used in the movie with the magnetic interference units on them has a distinctive kink in it's dish, and we see this truck destroyed by the aliens. Several shots later when the battle is over this truck is back again. (01:19:05 - 01:20:55)

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Deliberate mistake: The aliens fire on a bell tower with a clock on it. In the next shot a different building blows up. (01:17:15)

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Continuity mistake: As the first part of the exorcism comes to a close, Father Karras picks the blanket up off the floor and covers Regan with it. Father Merrin's red prayer book can be seen on the left night table but in the next shot it's moved and we see his crucifix there instead. (01:53:00)

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Visible crew/equipment: A soldier on the truck with a magnetic interference unit on it says, "Dr. Marvin, Dr. Marvin, we've made contact with GHQ". The crew can be seen filming across the street in the reflection in the truck. (01:19:45)

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Continuity mistake: A saucer crashes through the main window of a train station and the clock reads 11:10. Two shots later, we see the clock on the other side of the building, and it reads 10:43. (01:17:40)

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Audio problem: As the aliens announce their intentions to the people of earth Dr. Marvin walks up to a television set in the back of the lab and turns it on. We hear the over-dub of the aliens speaking through the television set but it's obvious that the unit never comes on. (01:04:55)

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Visible crew/equipment: As the alien spaceship rips apart the Washington monument, two shots later it falls to the ground and the bricks are not the right size and the wires holding them can be seen. (01:18:20)

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Continuity mistake: During the final attack the cloud cover is continuously changing. One minute it's clear, than over cast, then wispy cirrus clouds, then puffy cumulous clouds all between shots. (01:13:00)

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Deliberate mistake: As the saucer lands on the White House lawn the aliens walk out and fire on some soldiers, killing them. A few shots later we see them walking backwards into their spaceship as the film is obviously run backwards. (01:16:25)

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Continuity mistake: Regan sits up in bed as Father Merrin says, "By this sign of the Holy Cross" and she has no frozen vapor coming out of her mouth. In the next shot before her head spins around frozen vapor appears and can be seen all the way down to her blanket. (01:49:35)

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