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Continuity mistake: When Jake walks into Ida Sessions' house he looks into her bedroom and the shade on the left window is three quarters of the way up and in the dark. Several shots later we see this spot again and now the window is lit up and the shade is halfway down. (01:38:55 - 01:42:10)

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Continuity mistake: As the Marvin's listen to the tape recording of the UFO, Dr. Marvin stops the recorder and uses his finger to re-wind it. If you look closely he goes way past the spot where the sound started. (00:08:00)

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Continuity mistake: At 1972 Canyon Drive, Jake walks up to the front door, which is in the shade. In the next shot, as he walks in, the door is lit up. (01:47:20)

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Continuity mistake: In her bathroom Evelyn dabs Jake's nose with a piece of cotton and gets some blood on it. In the next shot it's another piece of cotton without any blood on it. Then in the shot after that the blood is back. (01:22:35)

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Continuity mistake: After they pull over to the side of the road to look at the UFO, Dr. Marvin gets back into the drivers side of the car as Carol slides unobstructed from the drivers side over to the passenger seat. In the next shot the tape recorder is sitting there between them. (00:05:55)

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Visible crew/equipment: As Jake drives up to Ida Sessions' house the crew can be seen filming across the street in the reflection on his car door. (01:37:50)

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Continuity mistake: After he takes a shower Jake draws his shades and the light goes dark from the wrong direction, behind him instead of from the window. (01:35:45)

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Continuity mistake: Carol and Dr. Marvin finally get to "Operation Sky Hook" and they're driving the exact same make and model car as they were in the previous shot. The only thing that has changed is the license number, which was AV-27-X3 and is now AV-35-B7. (00:06:55)

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Continuity mistake: As they are escorted out of the Mar Vista rest home, Jake kicks Claude Mulvihill in the stomach and if you look closely his hat never leaves his left hand as he smashes his head into the front railing. In the next shot as Claude drops his gun to the floor we see the hat on the ground next to it. (01:19:10)

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Revealing mistake: As Father Merrin speaks to another archaeologist in the beginning of the movie the clock on the wall stops between ticks and he turns around to look at it. It's easy to see that the clock pendulum has been pushed up against the window from behind in order to make it stop. (00:06:45)

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Visible crew/equipment: At "Operation Sky Hook" Dr. Marvin says to Carol, "I want you to transcribe these notes for my report" and you can see the shadow of the camera as it follows them on the left of the screen. (00:07:20 - 00:15:50)

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Continuity mistake: Back from the Mar Vista rest home, Evelyn and Jake have a drink at her house and the tape on Jake's nose is flush with his nostril. In the next shot it's peeling off. (01:20:50)

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Continuity mistake: Father Merrin walks over to see what the other archaeologist has found at the dig site and the items in the sifter move between shots in the close-up. (00:03:15)

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Continuity mistake: After they pull over to the side of the road to look at the UFO Dr. Marvin gets back into the drivers side of the car and his jacket is draped over the center of the front seat. In the next shot it disappears. (00:06:00)

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Continuity mistake: At the Mar Vista rest home, Evelyn Mulwray and Jake take a look into the room where the old women are sewing. In the next shot as they walk in, the woman on the left disappears. She's sitting next to the woman that points after Jake says, "Are any of you Emma Dill?". (01:17:25)

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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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