When Linda ( the girl with the baby) is tied up she is wearing patterned panties and a blue bra but when she is done counting to a 200 she has on a pink polka dot bra and blue panties .
At the police roadside checkpoint, you can clearly see when the cops are looking at the tires on Col. Williams' vehicle that he is driving a Jeep Grand Cherokee. The real Russell Williams drove a Nissan Pathfinder, and later in the movie (near the end of the interrogation), we hear the Jim Smyth character correctly reference the "Pathfinder tracks" in the field next to Jessica Lloyd's house.