Continuity mistake: When Teddy's kids are lying dead on the grass, the position of the girl's arms keeps changing between shots.
Continuity mistake: While Teddy Daniels is talking to George Noyce in his cell in ward C, each time the camera angle switches George change between scratching his head and no hand at all.
Continuity mistake: When Teddy swims towards the light house and gets out of the sea, his clothes are wet, few seconds later, when he is running up the stairs, his clothes are absolutely dry.
Continuity mistake: When Edward is entering the lighthouse, he grabs the doorknob on the left side of the door. Next shot, when we see him entering, the doorknob is on the right side.
Continuity mistake: When Teddy and Chuck are walking through the grave yard they approach a building which they enter to get out of the rain. When they are taking off their rain coats, Teddy throws his, but Chuck's just disappears between shots.
Continuity mistake: The first night Chuck and Teddy sleep in the bunk bed, Chuck's head is totally resting on the pillow in the close-up angle, as opposed to the semi-rigid position from the previous wide angle shot.
Continuity mistake: When Teddy's in the lake holding his dead kids, the amount of floating leaves increases / decreases randomly between shots.
Continuity mistake: Before Teddy finds Chuck dead, Chuck takes his hand to the pocket in his jacket to grab a paper. When the angle changes, his arm is in a different position and he repeats the previous movement.
Continuity mistake: The morning after Teddy's light-flash migraines, he and Chuck walk out into the center courtyard and look upon the havoc wreaked by the thunderstorm. Teddy glances up at the electric wires around the gated perimeter and sees a branch that had fallen and bent the line. In the first shot, the log is leaning into the courtyard. The shot then cuts closer and the log is leaning outside of the courtyard. When the shot cuts back to Teddy, the log is once again mostly inside the courtyard.
Continuity mistake: When Rachel is covered in blood she places her hand on Teddy's cheek. When the angle changes it's suddenly over his shoulder. The mistake is not due to the scene happening in an insane man's mind, it's not a plot-wise mistake.
Continuity mistake: In Cawley's office Teddy takes an aspirin with one hand and a glass of water with the other. Next shot his hands are empty.
Continuity mistake: Two cops run away from a wall when a tree falls in front of them. Half a second later they are standing still next to the wall, as if nothing had happened.
Continuity mistake: Teddy has a freckle or bruise next to the band-aid that appears and disappears all the time.
Continuity mistake: While talking with Teddy, Noyce's hand is either holding the bar or raised depending on the angle.
Continuity mistake: When the German officer is dying, his gun has a paper next to it. When Teddy kicks the gun away the paper is gone.
Continuity mistake: In the scene where Teddy is about to blow up the car, at first you see him stuffing the necktie into the gas tank. As he talks to his wife, he remarks to her that he never liked the tie, and he holds the entire tie up to her. In the next shot the tie is once again fully stuffed into the tank.
Continuity mistake: When Teddy interrupts the doctors' meeting, the coffee spoon on Dr. Cawley's saucer changes positions between the first and second angle.
Continuity mistake: When Leo has the doctor against the wall near the end with the syringe in his hand, in the angle looking at the doctor, the needle is closer to his neck, but when it switches sides to Leo, he is holding the syringe farther from his neck, within the space of seconds.
Continuity mistake: The lighthouse shown at 0:16:29 has more fences around than the same lighthouse shown at 1:20:00. The characters are also looking and pointing up to the lighthouse a long way away and lower down than they should be.
Continuity mistake: At the end of the movie, Teddy and Chuck are talking by the steps. Teddy's cigarette is in his mouth or away depending on the angle, with no continuity sense whatsoever.
Answer: I think Mrs Kearns is in on it. We see her get a little flustered when she is asked about the doctor, who we find out later is sitting right there. Also, she gets uncomfortable when Teddy brings up Andrew Laeddis. She even tries to warn Teddy. I just discovered this recently when watching with the subtitles, but when Teddy comes back from the cave, Mrs Kearns can be heard saying "I can't remember what I'm supposed to remember", likely referring to the script she was supposed to stick to.
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