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Visible crew/equipment: After the manager helps Polly out of the car she says, "Cabin B is ours?" and you can see the shadow of the crew moving on the dashboard of the car. (00:07:20)

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Continuity mistake: The manager knocks on the door to cabin B and the stone post in the background on the left of the screen is in direct sunlight. Two minutes of uninterrupted movie time goes by but as the Cutlers get ready to leave the stone post, and the falls behind them are no longer in direct sunlight. (00:08:00)

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Visible crew/equipment: At the Rainbow Cabins the Cutlers sit in their car and the manager says, "I've got you down for cabin B". The shadow of a boom mike moves across his face as he approaches the car. (00:06:40)

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Continuity mistake: The Cutlers drive into the Rainbow Cabins and the manager walks up to them pointing at his clipboard with his right index finger. In the next shot he's holding the clipboard with both hands. (00:06:40)

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Continuity mistake: Marilyn speaks to the cabin manager and says, "It's the first good sleep he's had in over a week" and the fur on her collar is motionless. In the next shot the wind is blowing it continuously. (00:08:30)

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Factual error: The Rainbow Cabins are on the Canadian side of the falls and when Ray Cutler looks over at the shredded wheat plant he should be looking at the American side. But the error here is that they show the Sir Adam Beck Generating Station which is also on the Canadian side of the falls. (00:06:50)

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Continuity mistake: The manager knocks on the door to cabin B and Marilyn comes walking out. The shades to her right are closed but two shots later they're opened. (00:08:25)

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Continuity mistake: In the first scene of the movie we see Marilyn in bed with a cup and saucer on the edge of the night stand. She doesn't touch it but as George walks in the room the cup moves about six inches back from the edge of the night stand. (00:03:00)

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Continuity mistake: As the Cutlers drive over the bridge into Canada the officer directing traffic is standing on the median. In the next shot he's in the middle of the road. (00:05:05)

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Continuity mistake: When the Cutlers drive up to the customs officer you can see the luggage behind them in the backseat. A few shots later as they're leaving the customs booth the luggage is not there. (00:05:10)

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Continuity mistake: In the first scene of the movie Marilyn is in bed smoking a cigarette and the shadow of the light coming through the Venetian blinds goes across the sheets from left to right. She hears George coming into the room, puts out the cigarette and in the next shot the shadow from the blinds has been rotated 90 degrees and is now extending from the foot of the bed to the head board. (00:03:20)

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Continuity mistake: As the Cutlers drive up to the Rainbow Cabins, before they speak to the manager the pages on the clipboard hanging next to the door are sticking out. Two shots later without anyone going near it, the clipboard has been moved as the pages are now flush with it. (00:06:25)

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Continuity mistake: After they leave the customs officer Ray Cutler says to Polly, with a wide grin on his face, "You should have told him we're on a delayed honeymoon". In the next shot he's not smiling at all. (00:06:05)

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Visible crew/equipment: In the close-up of the Cutlers as they drive away from the customs booth an equipment shadow appears on the right side of the hood of their car. (00:05:55)

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Visible crew/equipment: The Cutlers drive over the bridge into Canada and speak with the customs officer. If you look closely when the camera films over the customs officers back you can see the reflection of the crew standing behind him in the windows behind the car. (00:05:40)

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Continuity mistake: Ray Cutler says to the customs officer, "I'm going to catch up on my reading" and his right arm is leaning on the seat of the car. In the next shot his arm is at his side. (00:05:45)

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Continuity mistake: After the Cutlers leave the customs officer, Polly says to Ray, "Delayed or not" and the bottom half of her face has a shadow falling across it. In the next shot it's gone. (00:06:05)

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Continuity mistake: Both Marilyn and Jean's faces are dry as bones in the scene below Niagara Falls but Marilyn's lover is drenched. (00:13:50)

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Continuity mistake: The gash on Lomas' head changes between scenes. (01:16:15)

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Factual error: Joseph Cotton spends the second half of the movie trying to get out of Canada, but in the scene at The Cave of the Winds with Jean Peters, he must have forgotten that he was already on the American side of the falls. (00:54:00)

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