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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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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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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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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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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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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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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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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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Continuity mistake: Carol and Dr. Marvin stand in the front of the Supreme Court Building as the aliens destroy it. As they cut away to the long shots of the front of the building they're not there but then in the close-ups they are. (01:19:05)

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Continuity mistake: In the underground bunker Carol and Dr. Marvin listen to the aliens voice from the slowed down tape recorder. At first we see the tape in the middle of the spool than ten seconds later it jumps to the end. (00:25:45)

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Continuity mistake: After the first part of the exorcism Father Karras sits on the steps as Father Merrin walks to the bathroom. His coat and purple scarf are draped across the railing but two shots later as Father Karras goes back into Reagan's room the items have disappeared. (01:54:45)

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Continuity mistake: As the aliens announce their intentions to the people of earth Dr. Marvin walks up to a radio in the back of the lab and says, "If I'm right they'll sail into Washington in broad daylight…". If you look closely the radio is pointing to a different station that it was when we saw it previously in the scene even though no one has gone near it. (01:04:35)

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Continuity mistake: After the aliens announce their intentions Dr. Marvin and the generals meet together back at the Pentagon office. Dr. Marvin's hanky in his jacket pocket is arranged differently between shots. (01:07:05)

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Continuity mistake: Damien goes back into Reagan's room and takes the towel on the night stand to her right and wipes her forehead with it. He never puts it back on the nightstand but when Father Merrin comes back into the room it's there again. (01:56:15)

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Continuity mistake: After the first part of the exorcism, Father Merrin leaves Regan's room and we see his red prayer book and crucifix sitting on the nightstand as he does. He sits on the steps and then goes into the bathroom to take a pill, but later as he goes back into her room he has the book and crucifix in his hand. (01:53:00)

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Continuity mistake: Father Dyer runs to Chris' car at the end of the movie as we see another car coming at them and passing on their left. In the next shot that car has disappeared. (02:05:25)

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Continuity mistake: As Regan spins her head around her blue nightgown is now totally clean. (01:49:50)

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Continuity mistake: Father Merrin says, "I cast you out", and the green vomit that was around her mouth has now disappeared. (01:49:05)

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Continuity mistake: Father Merrin says, "Be gone" as he walks over to the other side of Regan's bed, and the lamp on her right almost falls over. In the next shot it's not moving at all. (01:49:25)

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