Did You Know?

When Regan insults Karras's mother, the lines don't match her mouth movements.
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Once, in the Iraq sequence, the shadow of a microphone is visible on Father Merrin's hat.
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William Peter Blatty closely modeled the exorcism scene on the actual rite of exorcism in the Church's "Rituale Romanum". Father Merrin can be seen opening a copy of the Rituale in the scene in question. However, the priests depart from the Rituale in two important details. First, there should have been four people (apart from Regan) in the room during the exorcism: the exorcist himself; an assistant priest to take over in case the exorcist died midway through; a member of the victim's family of the same sex as the victim, to help restrain her; and a doctor, to (among other things) administer any medication that was needed. Due to the "2 Priest rule", Fr Merrin should have delayed the second round of the exorcism and phoned the bishop to get a replacement for Fr Karras, instead of trying to tackle it on his own.
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The cigarette that Chris stomps out in the park is back in her hand a moment later.
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Father Karras's lighter changes hands just as he is about to light a cigarette in his apartment.
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When Karras is drunk in his bed, his friend takes his cigarette from him. A few shots later, when Karras is lying down, the cigarette is in his hand again.
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In the 2000 re-release, when Father Merrin asks Chris McNeil what Regan's middle name is, she is wearing a fur coat. When the priests enter Regan's room and Father Karras closes the door in her face, Mrs. McNeil is no longer wearing the coat. This was fixed on the DVD by adding a coat digitally.
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When Father Karras visits his mother at her house, he removes his collar and places it edge-wise on the shelf. In the next shot, the collar is lying down at a different angle.
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When Merrin and Karres enter Regans room to start the exorcism, Merrin opens a small black case and produces a crucifix which he kisses then puts on the bedside table. After the priests take a break from the exorcism, Merrin re-enters the room and takes the crucifix out of the case again.
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Regan has her hands in the air as light streams in front of her. Later, her hands are tied to the bed again.
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At the beginning of the exorcism, Regan's blanket is yellow. Towards the end, when Father Karras is checking her heart, the blanket is blue.
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While Chris is cursing the foreign operator on the telephone, the camera pans away to show Regan taking off her shoes on her bed with the bed to the LEFT of the door. However, in all previous and subsequent shots, Regan's bed is always to the RIGHT of the door.
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Whille recording Regan, Karas' left hand moves to start the tape recorder, but the cut-in shows him doing it with his right.
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In the birds-eye view of the scene where Damien is running around the track before meeting the detective, there is a fly on the camera lens.
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Near the end of the picture, Father Karras's stole seems to disappear in Regan's room, but that's because he puts a blue pullover on top of it because it's cold in there.
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During the exorcism, Reagan is lying on the bed with her head to one side while green vomit is pouring from her mouth onto the bed. The tube that pumps this "vomit" is visible on the back of her cheek, just under her ear.
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During the exorcism scene, the plasma bottle and stand are tipped over, and the nearly-full bottle smashes on the floor. No liquid comes out.
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After the language lab director tells Karas that the clockwise moving tape is English recorded backwards, and the tape is reversed, the tape is still moving clockwise.
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