Close to the end of the movie, when the shark is tied to the boat and about to rip of the cleats, the water as far as the eye can see is very choppy. Then, when Quint comes out with his machetee but doesn't need to use it, he throws it onto the edge of the boat. But when you see the water in the background, it is as smooth as glass. Yet when we pan back the water is still all choppy. Hmmmmm....