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Continuity mistake: After Chris returns home from the movie set, items on the window sill, the flowers on Sharon's desk and the pencils in her pencil holder all move inbetween the two close-up shots of her as she sits at her desk. (00:16:50)

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Continuity mistake: Father Karras is out for an early morning jog and jogs past the same place twice as he jumps three-quarters of the track between shots. (01:02:50)

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Continuity mistake: The long curtain on the window behind her has been noticeably moved between shots as a doctor puts Regan in a trance. (01:01:50)

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Continuity mistake: At the movie set, Chris yells, "Hold it, hold it" as Father Karras watches and walks away. In the next shot several extras along with the line of shade behind him disappear. (00:14:50)

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Continuity mistake: As Chris walks around the attic to see what's making the noise more candle wax appears dripping down its side between shots. (00:30:00)

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Continuity mistake: After Burke Dennings is killed, Chris goes upstairs and finds the window in Regan's room is wide open. It's so cold that you can see the condensation from her breath in some shots, but not in others. (00:59:10)

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Continuity mistake: Det. Kinderman throws his napkin down flat on the table in front of Chris as he gets up. In the next shot it has been rearranged on the table. (01:15:40)

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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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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 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: 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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Question: What happened to the movie that Chris was shooting. It just disappears from the script after Burke Dennings dies?

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Question: Who put the cross under Regan's pillow? It couldn't be the demon. (01:12:35)

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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: 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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Deliberate mistake: Father Merrin says, "It is He who commands you", and we hear and see the ceiling crack above his head. In the next shot we see the ceiling above him and they are no cracks in it, but four shots later we see the exact same spot and now cracks appear even though we hear no more cracking over-dubs after the first one. (01:49:15)

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