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Continuity mistake: At Hollis Mulwray's office look closely at the drapes behind his secretary as Jake first walks in. No one goes near them but by the time she gets back to her desk they've been rearranged. (00:51:25)

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Factual error: In Jake's office, Evelyn Mulwray stands by the window and a mid twentieth century modern building is outside it to the right. (00:57:20)

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Continuity mistake: The boat keeper throws his newspaper onto the ground as he runs to the boat that George Loomis is stealing. Later when Ray Cutler runs past that spot the newspaper is now on the chair. (01:16:25 - 01:17:15)

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Continuity mistake: The aerial shot of Carol and Dr. Marvin driving up to "Operation Sky Hook" shows a flat desert. In the next close-up shot of them inside the car we see a hilly terrain through the rear window. (00:02:40)

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Continuity mistake: As Jake and Noah Cross sit down to eat lunch the column holding up the roof of the building is on his left. He gets up to leave only to sit down again and now the column behind him is on his right. (01:04:05)

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Continuity mistake: George Loomis gets the engine of the Myra III running then proceeds to untie the two ropes from the dock leaving them dangling off the side of it. In the next shot as the boat sails away we see no ropes. (01:16:30)

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Continuity mistake: The telegraph report says that the UFO they're following is traveling in excess of 2000 mph but when they show the jets speed gauge it's only going 650 mph. (00:00:25)

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Continuity mistake: Mulwray's Secretary and Jake have a conversation as he waits to talk to Russ Yelburton. They do an excellent job keeping things tidy on her desk between shots but the white flowers and Jake's hat move without anyone going near them. (00:53:15)

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Continuity mistake: At Hollis Mulwray's office, Jake holds up the same envelope that we saw as Evelyn Mulwray talked to him in the restaurant. The address is now different and the street number is smaller. (00:51:10)

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Continuity mistake: The UFO flies right over the cockpit of a United Airlines jetliner but does not leave a shadow. (00:00:45)

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Continuity mistake: As George Loomis tries to steal the boat there's an ice bucket underneath the table to the right of the steering wheel. Later Polly comes back with some beer and grabs for the ice bucket, which has been rotated 45 degrees even though no one went near it. (01:15:35)

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Continuity mistake: At Hollis Mulwray's office, Jake looks at the picture of Noah Cross on the wall. At first the shadow of his head falls on the picture but in the next close-up shot it's gone. (00:51:05)

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Continuity mistake: As he returns to his office, Sophie tells Jake that Evelyn Mulwray is in there. Notice the three pictures on the wall between the two windows, which are perfectly straight. In the next shot after he walks in the bottom picture is crooked. (00:57:05)

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Continuity mistake: George Loomis tries to steal the boat and pulls the ignition wires straight out from under the lock. No one touches them but the next time we see them they're hanging differently. (01:14:55 - 01:16:10)

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Continuity mistake: Jake and Noah Cross sit down to eat and the piece of lemon on Jake's plate moves between shots in the close-up. (01:01:15)

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Continuity mistake: Inspector Starkey gets into the police car before Ray Cutler, who sits in the rear driver side seat as they pull away. Several shots later we see them again in a close-up chasing George Loomis and their positions in the rear of the police car have reversed. (01:20:50)

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Continuity mistake: When Jake and Noah Cross sit down to eat, their glasses are empty. In the next shot Jake's glass is filled with white wine. Later the waiter fills the empty glass again with white wine. (01:01:20)

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Visible crew/equipment: Carol and Dr. Marvin drive by the "Operation Sky Hook" sign and you can see the shadow of the camera on it as they pass. (00:02:50)

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Continuity mistake: Between the second and third shot of the movie the cockpit of the jet changes in the close-up. (00:00:20)

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Revealing mistake: When Jake talks with a boy on a horse at the bottom of the LA River, in the distance you can see a television antenna on top of a house. There were no television antennas in Los Angeles in 1937. (00:39:45)

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