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Continuity mistake: After Chris is startled by the exploding flame in the attic there's a shot of a priest caring flowers into the courtyard of a church and if you look closely the flowers on the right are the same in the close-up but the flowers on the left are not. When he walks into the chapel the flowers are rearranged again. (00:31:20)

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Continuity mistake: Before Chris goes up into the attic to see what's making the noise Regan is wearing a blue nightgown. A few seconds later they cut back to her and she's wearing a pink nightgown. (00:28:30)

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Continuity mistake: In bed Regan reads "Photoplay" magazine as Chris touches the covers of the bed. In the next shot she's pulling the magazine away from Regan. (00:23:30)

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Continuity mistake: As Chris goes up into the attic to see what's making the noise, the flame on the candle gets longer between shots as she walks up the steps. (00:29:45)

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Continuity mistake: Father Damien and Tom have a drink at a local bar where Damien confides that he has lost his faith. When he brings the beers over both glasses are full but several seconds later when he takes his first sip the head is already gone. (00:26:50)

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Continuity mistake: After Chris is startled by the exploding flame in the attic there's a shot of a priest carrying flowers across a courtyard into a chapel. When he first opens the door to the chapel he's in the shade, but when we see him walking into the chapel from the other side of the door the sun is shining. (00:31:30)

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Continuity mistake: Chris talks to Regan as she puts her to bed. If you look closely the large pictures on her night table change position throughout the scene. (00:23:45)

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Continuity mistake: Chris and Regan walk back to Sharon's desk and the radio on the shelf to the right of the desk has moved between shots. (00:17:20)

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Continuity mistake: Father Karras bandages his mother's leg and we see her right hand as she raises it and he says, "Mama, I could take you somewhere…". In the next shot she raises her hand to her head and she now has a band-aid on her wrist. (00:20:50)

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Continuity mistake: Father Karras eats dinner in his mother's apartment and the curtain on the far side of the table moves without being touched the second time we see it. (00:20:25)

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Continuity mistake: Before Father Karras walks into his mother's apartment the lights are on. In the next shot as he walks in the lights are off and he turns them on. (00:19:10)

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Continuity mistake: In the scene in their basement Chris brings the Ouija board over to the ping pong table and Regan puts the paddle down with the ball underneath. In the next shot the paddle is there but the ball disappears. (00:22:45)

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Continuity mistake: As Father Karras goes to New York to see his mother a woman in yellow on the sidewalk with her two children disappear between shots as he crosses the street. (00:18:30)

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Continuity mistake: As Chris and Regan discuss how to play the Ouija board the pointer is to the right of the word No. In the next shot when Regan picks it up it's covering the word No. (00:23:10)

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Continuity mistake: In the scene in their basement Chris takes the painted bird from Regan who touches the wood post in the center of the room with her right hand. In the next shot she's leaning against it. (00:22:15)

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Continuity mistake: After returning home from the movie set Chris walks in and says hello to Sharon. The bottle of Coke, the typewriter carriage and the page she is typing all move between shots by the time Chris gets to the desk. (00:16:10)

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Continuity mistake: After returning home from the movie set, Chris gets a letter from the White House which she reads with both hands. Regan says, "Hi Mom" and in the next shot Chris has a drink in her hand. (00:16:35)

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Continuity mistake: At the movie set, Chris says to Burke Dennings, "It just doesn't make sense" and the guy in the blue shirt in the background is standing up. In the next shot he's bending over. (00:13:20)

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Continuity mistake: After returning home from the movie set, Chris' necklace is tucked under her collar. She doesn't go near it but two shots later it's over her collar. (00:16:30)

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Continuity mistake: In the archaeologists office at the beginning of the movie Father Merrin looks at the clock on the wall as it stops. The first time we see it the pendulum is to the left of center but the second time we see it, it's dead center and it hasn't been touched. (00:06:45)

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