The Boat Scene
They push the boat off the top of the hill to start off. Then it stops and sways over the cliff for a few seconds. Then the boat falls some more. Right when the boat is about to slide down the hill the second time, put the tape in slow-motion. When the boat is going down hill, look into the dust trail it leaves and you will see the rope hooked to the boat.
Not only is the boat flipped right side up, but if you notice when they first climb into the boat, it is an entirely brand new one. Watch as the boat hits the water, the bottom of it is severely dented in and there are scratches all over it. I understand that they had to change the boats because it probably had a few holes in it at this point. But the crew could have at least dented up this new boat, or at least put some scratches on it to make it look similar to the other boat.