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Continuity mistake: When the Canadian motorcycle police drive up and speak to the boat keeper about George Loomis they're all in direct sunlight with no trees anywhere near them. When they leave several shots later it must be an entirely different time of day because shade from the trees across the street covers the entire set. (01:12:25)

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Continuity mistake: After fishing on the Niagara river with the Cutler's, Mr. Kettering pulls his boat up to a dock that is in the shade. In the next shot the dock is in the sunlight. (01:11:30)

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Continuity mistake: Ray Cutler decides they should leave the Rainbow Cabins and picks up one of two stacks of books on a table to the right of the front door as he talks to Polly. No one goes near this spot but earlier in the scene there was only one stack of books along with a pocketbook (which is now on the floor) on the table. (00:49:45)

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Continuity mistake: As the Canadian motorcycle police drive away George Loomis hides across the street behind a boat and some items that look like they belong in a tag sale. In the next shot as he walks away all of the items on the right of the boat have been rearranged. (01:13:10)

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Continuity mistake: When the Canadian motorcycle police drive up and speak to the boat keeper about George Loomis, one is wearing a white shirt and the other a blue shirt. In the next close-up shot they're both wearing blue shirts. (01:12:25)

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Continuity mistake: Before Jake gets out of the barber's chair to yell at the banker the news paper in his hands is folded in half. In the next shot it's laying flat in his lap. (00:17:10)

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Continuity mistake: When we see Katherine Cross and Hollis Mulwray's reflection in Jake's camera lens, Hollis is standing in a different spot than we saw in the shot before. In the reflection he's in front of the chair but in the previous shot he was next to the chair. (00:16:05)

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Continuity mistake: Polly decides to take a nap in cabin B and the ash tray on the night table moves to the edge during the scene without her going near it. (00:46:45)

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Continuity mistake: There's a very cool shot of Katherine Cross and Hollis Mulwray's reflection in the camera lens as Jake takes their picture from a roof top while they're having lunch. The problem is as the cameraman zooms in, Jake's hands are shaking but the reflection in the lens doesn't. (00:16:05)

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Continuity mistake: At the office, Jake picks up the photos of Hollis Mulwray and Noah Cross, which Lawrence Walsh gives him, with both hands. In the next shot he's holding them with his left hand. (00:13:30)

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Continuity mistake: Mr. Qua is watering the flowers and as Polly Cutler speaks to the Kettering's we see the front of the car and there's no water on the gravel by the tire. After they get into the car and drive away in the next shot, there's a lot of water on the gravel. (00:45:15)

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Continuity mistake: As Jake takes their picture from the roof top we see Katherine Cross and Hollis Mulwray's reflection in the camera lens and her dress is a direct sunlight in the reflection but not in the previous shot. (00:16:05)

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Continuity mistake: Ray Cutler decides to leave the Rainbow Cabins and says to Polly, "Give me a hand with this stuff, will ya, Honey". As he says this he picks up a suitcase which has nothing on top of it, but when we saw it earlier in the scene there were clothes on top of it. (00:49:35)

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Continuity mistake: Marilyn sleeps in her hospital bed as the song "Kiss" plays from the bell tower. At first she's sleeping on her back then in the next shot she's on her side. (00:57:15)

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Continuity mistake: George Loomis chases Polly at the Cave Of The Winds and she almost gets killed braking apart the wooden rail as she runs into it. The part of the railing hanging on the left changes position between shots. (00:54:40)

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Continuity mistake: Marilyn walks up to the ticket booth and gets a refund for one of the tickets to Chicago that she bought earlier in the movie. Looking at her luggage we see no marks on it at all. She picks it up the same way she puts it down, but in the next shot a large black mark appears on the front of it. (01:01:15)

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Continuity mistake: Hollis Mulwray rows Katherine Cross around Echo Park in a rowboat. When we first see them her hands are in her lap but in the next shot her left hand is touching the side of the boat. (00:15:20)

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Continuity mistake: As Polly Cutler lays out on a beach chair sunning herself Ray steps back and decides to take a picture of her sitting there. Niagara Falls, which are always seen behind them are not in this shot, which has obviously been filmed on a sound stage. The bushes against the stone pillar are also different. (00:34:55)

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Continuity mistake: At the Rainbow Cabins, Mrs. Kettering hands Polly Cutler a bouquet of roses and the pink bow is on the left. In the next shot the bow is rotated 45 degrees to the right and is now facing Mrs. Kettering. (00:44:10)

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Continuity mistake: Marilyn's lover writes a one line message to her on a postcard and places it back into the postcard rack. She walks over and reads it and we now see that there are 6 lines written on the back of the card. (00:34:05)

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