Revealing mistake: Most of the police cars are late model Ford Sierras, but any police car that crashes has been substituted for a much older early model Sierra.
Continuity mistake: Mr Sullivan gives the stolen snow blower to his ex wife's husband for safe keeping, suggesting a tarp in the back of the garage. In a subsequent scene the snow blower is back in Sully's pickup for all to see.
Continuity mistake: When Officer Muldoon shakes hands with the girl his hand is on top then instantly on the bottom.
Continuity mistake: When Cane's agent gets out off the bookstore and crosses the street, the cars keeps changing all the time between shots.
Visible crew/equipment: When Vincent is washing his face in the bathroom at the diner, you can see a male crew member's face in the mirror.