When the rape victim walks up to the party, she initially puts a bloody hand-print approximately halfway between the center of the hood and the side, but when the crime scene photos are shown, the hand-print is on the corner of the hood, toward the driver side headlight.
When the rape victim walks up to the party at the beginning, her right shoe is missing. But, during the flashbacks, it's her left shoe that is missing.
When Mac moves into the crawlspace above the shop, the screen of his scanner shows a "Solitaire" screen shot.
When Mac climbs in the attic, you can see a game of Solitaire on the metal detecting gun's screen.