In the first shot where they find the moose, the arrow is shown in the lower left of the moose, in the next close-up, the arrow has moved to a position between the ribs.
When the kids bike up to the abandoned motorcycle, Chad picks up and then puts down the helmet, which then falls off the motorcycle. Later, when they come back, the helmet is back on the motorcycle.
At 1:18:00 Laura is shown about to ascend the cliff wall and then briefly is shown topping the cliff edge, then in the next scene again beginning to ascend the cliff edge.
At minute 31:00 during the tremor, the desk the Chief is holding onto is moving independently from the action of the floor. The desk appears to be mounted on a rocker mechanism to show greater movement.
When Jim is testing his portable flame thrower, two hoses are visible; the fake one going to his backpack, and the real gas line running down the front of his pants to the ground off-camera.
While stopping to get a map, a crew member can be seen to the right of the screen cuing the truck to brake.
When the two boys run from the abandoned motorcycle toward the anthill there's apparently the shadow of the camera briefly on the ground.