Go to the part where Chris and David are at the cabin. Then, go to the part where Chris is falls and rolls down the hill. He gets stopped by a rock and stands up. Look at his shirat and pants. They are so muddied up. Keep that in mind. Then, keep watching as he falls down the hill and stops at the end, face down. Then, watch as he stands up. His shirt and pants are miraculously cleaner!!! Remember back at the rock part, they were a solid muddy tan. Now, they're only spotted with dirt! Oops!