Without a Paddle (2004) - 31 mistakes
starring Matthew Lillard, Seth Green
Continuity: Near the end, when Tom, Jerry, and Dan are about to be shot by the two hillbillies and the cop, there is a brief scene that shows all three guns being loaded from a side view. The gun closest to the camera is a handgun. When the camera zooms out, all three men have rifles. There is no handgun to be seen.
Continuity: In the pot shack scene Dax Shepard is holding the package of pot to his side, you see him slowly move it behind his back to hide it from the two hillbillies. In the next scene, after they flash back from the hillbillies, it's back at his side and he's once again slowly moving it to his back. Shepard, and the other cast, admit this is a mistake in the commentary.
Visible crew/equipment: When Billy drives away you can see the boom mike operator reflected in the side window of the car. Submitted by Mortug
Continuity: When the guys are in the tree house right after Dan tells the girls about using the pussy willow reeds you can see Tom just about to take a drink from a canteen, then maybe a second later in the very next shot it shows Jerry taking the canteen from Dan and passing it on around the circle.