During the last half of the movie, Brody, Hooper, and Quint start fighting the shark from the boat. They try to keep the shark afloat with yellow, air-filled barrels that are attached to ropes which are shot into the shark with an arrow gun. They begin with 5 barrels on board. Eventually, they end up shooting 3 barrels into the shark, which should leave 2 on board. However, a little later in the movie, a shot of the boat shows 3 barrels still on board.