- Continuity: When Dr. Peterson enters the library at the mental hospital, The word "LIBRARY" is clearly visible on the door in large letters. When she exits, it is gone.
- Revealing mistakes: When John Ballantine, after seeing snow in Dr. Brulov's house, drops and breaks a cup full of coffee, no coffee spills on the carpet. Instead, we see some thin black disc made from wood or plastic pasted into the cup.
- Continuity: When Dr. Brulov wakes J.B. to ask about his dreams, J.B.'s hair is very messed up. However, when Dr. Peterson enters the room with coffee a couple of minutes later, J.B.'s hair is neat, even though he hasn't combed it.
- Continuity: The envelope which John Ballantine slips under the door of Dr. Peterson's room remains close the door and with its border parallel to the door bottom line. Later it appears a little distant from the door and skewed.
- Continuity: The burn on JB's hand is only visible during the scene where they talk about it. It disappears in every other scene where his hand is visible (like when he is sitting on the couch with Dr Brulow).
- Continuity: In his first scene Michael Chekov's hair changes.
- Revealing mistakes: When the hotel bellboy brings the newspaper to Constance he notices her photograph on the front page. Freeze-framing reveals that the articles adjacent to the photograph are actually random paragraphs of text.
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- Continuity: SPOILER: At the end of the movie when Dr. Murchison points the revolver at Dr. Petersen, he is holding a large frame Colt New Service .45 with a 5 1/2" barrel, when he turns the gun on himself he is holding a medium frame Smith & Wesson model 10 .38 with a 4" barrel.
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