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Continuity mistake: Father Merrin watches three metal smiths working and the piece of metal on the anvil is red hot in one shot and not in the next. (00:05:45)

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Continuity mistake: After they pull over to the side of the road and look at the UFO, Dr. Marvin gets back into the drivers seat and hands Carol a Chesterfield from his shirt pocket. In the previous shot he didn't have anything in his shirt pocket, in fact he didn't even have a pocket on his shirt. (00:06:00)

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Continuity mistake: After he takes a shower Jake's stitches are very visible as they stick straight out of his nose. In the next shot they are different and you can hardly see them. This happens many times throughout the movie. (01:36:20)

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Continuity mistake: At the Mar Vista rest home, as he smashes Claude Mulvihill's head into the front railing, Claude drops his gun to the floor and we see Jake's hat on the ground next to it. Mr. Palmer walks over and tries to pick the gun up as Jack kicks it away and we now see the hat is overturned even though Jack and Claude moved away from that spot during their fight. (01:19:30)

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Continuity mistake: After their visit to the Mar Vista rest home, Evelyn and Jake have a drink at her house and both glasses have more liquid in them between shots. (01:20:50)

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Continuity mistake: At the dig site in the beginning of the movie, the items on the rock behind Father Merrin move in the close-up after the other archaeologist shows him what he has found. (00:03:25)

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Continuity mistake: As Polly and George Loomis are rushing down the middle of the Niagara River a tree appears above Polly's head on the back of the boat. (01:23:10)

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Continuity mistake: The UFO flies over the Marvin's car as they approach "Operation Sky Hook" and causes them to pull over to the side of the road. When the doctor gets out of the car they're in a different place than they were in the previous shot. (00:05:35)

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Continuity mistake: As Jake gets chased by the farmers in the orange grove the marks on his windshield change between shots. (01:09:40)

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Continuity mistake: As Evelyn Mulwray drives Jake home after his altercation with the farmer, look closely at the piece of paper he pulls out of his pocket with the landowners names on at. It doesn't have any of the paper tabs hanging off of it that we saw before as Jake stole it from the Hall of Records. (01:13:45)

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Continuity mistake: Jake Goes to the Los Angeles County Hall of Records. The coat hanging on the coat rack and the chair behind "the weasel" move between shots without being touched. (01:06:55)

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Continuity mistake: The Marvin's pull over to the side of the road to look at the UFO and the upholstery of their car changes from black to white between shots. (00:05:30)

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Continuity mistake: George Loomis goes over the falls and Polly is safely on an island in the middle of the river with green trees on it. Several shots later the trees are purple. (01:26:35)

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Continuity mistake: When the Marvin's start necking as they drive to "Operation Sky Hook", the background we see through the rear window shows a curve, but Carol's hands on the steering wheel never move. (00:03:25)

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Continuity mistake: Before the farmer's son hits Jake over the head with his crutch there's blood on the right side of his shirt. In the next scene as he wakes up to see Evelyn Mulwray there's less blood on his shirt. (01:12:45)

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Continuity mistake: The UFO flies over the Marvin's car as they approach "Operation Sky Hook", and Dr. Marvin tells Carol to pull over. She immediately turns the steering wheel to the left but in the next shot she's steering straight ahead. (00:05:30)

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Continuity mistake: The farmer's son hits Jake over the head with his crutch and as he falls to the ground the bandage around his right nostril has moved from earlier in the scene. (01:12:25)

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Continuity mistake: A farmer shoots Jake's radiator, which spurts a steady stream of water and steam. In the next shot when the car crashes the radiator is not leaking. (01:10:30)

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Continuity mistake: Polly is safely on an island in the middle of the river as we see the helicopter coming to rescue her. Unfortunately when we see her they're showing us the falls from the wrong direction and we can see the island she's supposed to be on behind her. (01:26:35)

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Continuity mistake: There are two actresses playing Dorothy (and two dogs playing Toto) as she opens the door to Oz. The first is a stand-in wearing a dull colored dress in order to make it look black and white. After she opens the door and moves out of the way, Judy Garland is who we actually see walking through. Look at the different pleats on the two dresses. (00:19:25)

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