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Continuity mistake: Back at his apartment Damien plays the tape of Regan backwards again on his tape recorder. Some items on the 1st and 2nd shelf on the back wall are rearranged between shots. (01:35:55)

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Continuity mistake: As Father Karras listens to a tape recording of Regan at the university language lab the lamp above his head is on his left. In the next shot it's right in front of him. (01:29:30)

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Continuity mistake: Father Merrin opens his red prayer book on the bedspread on the edge of Regan's bed and the page marker can be seen as he opens it. In subsequent shots the marker is not in his book, but can be seen in Damien's. (01:45:00)

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Continuity mistake: Father Karras goes to see Bishop Michael trying to convince him that an Exorcism would be appropriate for Regan. If you look closely the chair on Father Karras' left, the chord to the black phone and the waste paper basket all move between shots. (01:38:35)

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Continuity mistake: Father Karras listens to a tape recording of Regan at the university language lab and there are three rows of seats in front of him. In the next shot from behind there are two rows in front of him. (01:29:35)

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Continuity mistake: As Father Karras listens to a tape recording of Regan at the university language lab we see the tape recorder running, a pen in his right hand and no ash tray or cigarette. In the next shot from behind smoke rises from a lit cigarette and the pen is on the desk. (01:29:15)

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Continuity mistake: In his apartment as Father Karras listens to the backwards tape of the voices coming from Regan, the tape recorder moves about four inches away from the edge of the desk between shots. (01:36:20)

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Continuity mistake: Damien brings a tape recorder to Regan's room and a brown/green plastic bowl is on the table to her left. In the next shot when the draw of the table pops out the plastic bowl is moved back about four inches. (01:31:10)

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Continuity mistake: Damien plays the tape of Regan for the Language Lab Director and when we first see them a chair is in front of Damien. In the next shot the chair is gone and a coat appears next to him on his right. (01:35:30)

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Continuity mistake: Damien starts the tape recorder in Regan's room twice between shots. (01:31:40)

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Continuity mistake: As the Language Lab Director plays the tape of Regan backwards for Damien he turns on the wrong tape recorder. There's no indication that this is not the first time he's heard the tape and he uses the recorder on the left to listen, and is not dubbing anything onto the recorder on the right. When we hear the backwards tape he uses the recorder on the right which does not have the right tape spooled up and doesn't have an overdub of the original to play backwards either. (01:35:40)

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Continuity mistake: Lots of stuff moves as Damien waits on the couch in Chris's living room as she pours him a drink. The flower pot on the back wall under the ceramic pumpkin moves to the left and the couch he's sitting on moves a couple of feet to the left. Later everything moves back. (01:34:00)

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Continuity mistake: The Language Lab Director plays the tape of Regan backwards for Damien but if you look at the tape it's running in the same direction. (01:35:45)

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Continuity mistake: At her front door, Father Karras asks Chris, "Did Regan know a priest was coming over?" as he looks at her. In the next shot he's looking down. (01:28:10)

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Continuity mistake: In the basement as Chris irons Father Karras' clean shirt, her cup on the ironing table rotates 45 degrees throughout the scene without being touched. (01:25:55)

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Continuity mistake: Father Karras confronts Regan for the first time and just before she pukes on him fresh vomit appears on her night gown. Her eye makeup becomes darker and her hair is matted down also between shots. (01:25:35)

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Continuity mistake: Before she gets up from the table, Chris asks Det. Kinderman, "Would you like some more coffee?". His cup is obviously empty as she picks it up but if you look closely throughout this continuous scene, he's never touched it. (01:15:50)

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Continuity mistake: Chris walks with Damien after they meet on the bridge. As they talk she's smoking a cigarette, which she throws down and puts out with her foot. After she says, "How you go about getting an exorcism?" the cigarette is back in her right hand. (01:21:20)

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Continuity mistake: In the scene with the crucifix, Chris falls to the floor after Regan bashes her in the face. Look closely at the dresser that eventually comes sliding across the room at her. When we first see it, it's about half a foot to the right of the closet door on the left of the room, and is never touched or moved. When we see it again as it comes sliding across the room at Chris it's been moved to the left right up against the closet door. (01:19:10)

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Continuity mistake: Chris first meets Damien on a bridge as two other people walk in front of him. In the next shot they're behind him. (01:19:40)

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