When henchman Al guards Tom Duncan all tied up with his hands behind his back, Duncan's horse shows up, and Duncan clearly sees him through an open window. However, when Duncan backs up to the window to have the horse chew through the rope around his wrists, the window is completely covered by a pair of curtains.
During the fight scene on the wagon, in long shots Tom is wearing his hat. When it switches to a closeup, his hat is lying in the bed of the wagon. Thus, in switching back and forth between long shots and closeups, his hat is magically on and off.