When the Red F-150 gets towed from out in the desert, the shot inside of the tow truck shows a gray curtain behind the three occupants covering the rear window. In the following shot from outside, behind, and above following the tow truck, there is no gray curtain in the back window, and you can clearly see occupants in the vehicle.
When Leo (Tommy Lee Jones) draws a handgun to shoot at the coyote that took Romeo (Suzie's dog), the handgun he picks up from the paint desk is clearly a P200-series Sig Sauer. In the very next scene when he shoots the gun, however, it is suddenly a 1911-style handgun (He also uses a 1911 for the remainder of the film).
During the kidnapping of Rene Russo someone stated that the semiautomatic she tried to fire would not have clicked more than once. Not true, my S&W double action semiautomatic, when empty will fire (click) every time I pull the trigger. Only single actions will not fire repeatedly. You would have to cock the hammer before each pull.