When the detectives find Little Ann in the killing fields she is bound both hand and foot. Detective Souder cuts the rope binding her feet, but not her hands. Detective Heigh picks her up with her hands still tied, but in the next scene her hands are free.
Sam Worthington as Souder describes the Green Pontiac as having a dent in the back and having custom wheels. At that point in the movie there is no visible dent in the back of the Pontiac and the wheels are not custom, they are stock Pontiac wheels (on the Blu-ray and possibly on the DVD as well in pause mode, a viewer can clearly see the Pontiac logo of a red arrowhead on the hub of the wheels).