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Revealing mistake: As Chris walks around the attic to see what's making the noise the shadow of the candlestick appears on her face which is not possible as it's the only light source up there. (00:30:15)

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Visible crew/equipment: When Michael Douglas pulls his car in front of Jonny Boz' house after the initial murder scene policemen on the far corner can be seen directing traffic away from the movie set, at the top of the hill. (00:04:10)

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Revealing mistake: When Michael Douglas pulls his car in front of Jonny Boz' house after the initial murder we hear him come to a screeching halt. If you look closely, perfect tire skid marks can be seen in the exact same spot on the road in front of his police car before it comes to a stop. (00:04:15)

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Other mistake: Detectives Dundy and Polhaus visit Bogart at 3:40 in the middle of the night as we see the time on his alarm clock after they walk in. In the previous shot it's impossible to tell what time it is time because there are no hands on the clock. (00:11:10)

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Continuity mistake: On Jeanne Tripplehorn's desk, there's a large spherical polished rock that has been moved around between shots as Michael Douglas has his first interview with her. (00:14:00)

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Continuity mistake: At 1972 Canyon Drive, Jake sits down and says to Evelyn Mulwray, "Do you know any good criminal lawyers?". If you look closely the dress on the chair to his left has been rearranged between shots. (01:48:45)

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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: There's no smoke inside of the alien spaceship but if you look closely before the motorcycle cop fires his gun, smoke from a previous take can be seen swirling above their heads. (00:42:30)

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Continuity mistake: The alien's show a Navy Destroyer being destroyed by their death rays. Later as it explodes we see the remains of an aircraft carrier. (00:40:40)

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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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Revealing mistake: When Carol, Dr. Marvin and the others enter the alien spaceship it's obvious by the sound that that they are walking on plywood made to look like metal. (00:37:10)

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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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Revealing mistake: As the alien's speak to Carol, Dr. Marvin and the others inside their spaceship, they use the exact same footage again of them looking at the video screen as they leave earth even though one minute of movie time has elapsed. (00:39:25)

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Continuity mistake: The alien's speak to Carol, Dr. Marvin and the others and show them a Navy Destroyer on their video screen firing on an alien spaceship. If you look closely the guns on the ship are not aimed at the alien spaceship. (00:40:35)

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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: The motorcycle cop looks up at the alien's Infinitely Indexed Memory Bank and the front of his hair is combed up into a pompadour. In the previous shot it was combed down. (00:43:00)

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