Visible crew/equipment: When Dormer is chasing Finch through the fog there are two shots where you can see orange power cables on the ground near Dormer's feet. (00:26:00)
Insomnia (2002)
1 visible crew/equipment mistake
Directed by: Christopher Nolan
Starring: Robin Williams, Al Pacino, Hilary Swank, Martin Donovan, Oliver 'Ole' Zemen
Continuity mistake: When Dormer and Finch meet up after the interrogation, Dormer slams Fince against a metal support beam and the position of his hands of Finch change from being pressed against Finch's left cheek to being pressed against his neck/shoulder area as the camera angle changes. Happens about 3 times during scene.
Ellie Burr: A good cop can't sleep because he's missing a piece of the puzzle. And a bad cop can't sleep because his conscience won't let him.
Trivia: Al Pacino's character is named Will Dormer; Dorm is the latin root for 'sleep'.
More questions & answers from Insomnia
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.