Continuity mistake: In the scene on the ferry, when Williams and Pacino are talking, in the shots showing Williams, Pacino is facing the center of the ferry frequently, while immediately afterward in the shots showing Pacino, he is facing Williams again.

Insomnia (2002)
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Directed by: Christopher Nolan
Starring: Robin Williams, Al Pacino, Hilary Swank, Martin Donovan, Oliver 'Ole' Zemen
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Insomnia is a thriller about a 17 year-old girl who was murdered in Alaska by a popular writer and whose killer is pursued by a questionable cop. Atmospheric and with good performances by Al Pacino, Robin Williams and Hilary Swank. Watch this.
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'.
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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.