Continuity mistake: In the scene where the scouts jumped in the river, you see Bragdon and the FBI agent get in the helicopter. The the camera goes to Max in the river going downstream; he looks at his watch and puts it up to his ear because the watch broke, since he was in the water. But later in the scene, where Max is climbing up the hill and looks at the mountain they're about to climb, he looks at his watch and it's still working.
Visible crew/equipment: When Palmer thinks rain is coming down and it first shows the drops, the guy that was holding the water squirter thingey accidentally makes the water squirt to the side. You can see the water squirt to the side and look to the left, there is no water squirting there, so the guy has to aim again so that the water fits in the camera angle.
Continuity mistake: In the scene where the scouts fill the cantine with the sleeping pills you see Max walking in the woods with the scouts behind him. If you look at Max, you can see he's smoking a cigarette, but when the camera goes up to Max, the cigarette is gone.