Revealing mistake: When Dormer fails to pursue Finch during the log chase scene, he climbs out of the water by a ladder. If you look at Dormer's back as he gets out of the water onto the dock you can see an outline of the life jacket Pacino wore to film the scene. You can see the outline again when he turns around and walks up the walkway. (01:00:49 - 01:01:11)
Insomnia (2002)
1 revealing mistake
Directed by: Christopher Nolan
Starring: Robin Williams, Al Pacino, Hilary Swank, Martin Donovan, Oliver 'Ole' Zemen
Continuity mistake: When Robin Williams is being questioned by the police for the first time, one of the cops is talking to him. Very soon afterward the cop leaves the room and is walking away. We see the cop in the distance in another room, yet we hear the cop talking to Robin Williams again as Al Pacino shuts the door. Almost immediately, the camera angle changes to the cop as he finishes talking. He is standing in front of Robin Williams again.
Will Dormer: This guy crossed the line and didn't even blink.
Trivia: Not a mistake, just something nice to notice: "Dormer" sounds like "dormeur" that is to say the French for "sleeper".
More questions & answers from Insomnia
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Chosen answer: It represents Al Pacino's character planting evidence on men he knew were guilty. He was planting the victim's blood on their clothes so the evidence would be stronger against them.
In addition, there is a repeated scene where someone (Dormer) is wiping something on or off a fabric.