Revealing mistake: Just after the first shark attack, Chief Brody and his deputy discover the beached remains of the nude swimmer. As Chief Brody hesitantly approaches the grisly scene, the camera cuts to a close-up of a mutilated female arm and other viscera, covered with a creeping cluster of small saltwater crabs. Inexplicably, a single crab falls out of thin air on the right side of the screen to join the others. A moment later, Chief Brody arrives at the scene, in the background. Obviously, a film crew member dumped a bucket of live crabs onto the body parts for this shot, but poor editing allowed one of the animals to be seen falling onto the pile.Charles Austin Miller
Other mistake: The five yellow barrels are not on the Orca when they are getting ready to leave shore. When Quint begins singing, goes and stands at the cabin door, you can see through the front windows that the barrels are not there. With the Orca leaving just moments later, they should have already had the barrels on board. (01:07:30)mightymick
Continuity mistake: Before Alex Kintner is attacked, Sean Brody is shown sitting on the beach singing. After Alex is attacked and people are running out of the water, Sean can be seen standing on the beach, and in one shot, Chief Brody can be seen grabbing him. But a couple of seconds later, Sean is shown sitting on the beach in the same spot he was before, as if he hadn't moved. (00:16:55)mightymick
Other mistake: Two errors when Hooper is at the helm...the first is Quint yelling at Hooper "starboard, ain't you watching?"the shark is actually running from the port side of Orca. The second is when Quintbtells Hooper to head SSE...Orca turns to starboard while moving ahead...a SSE course would be a turn to port.FLKeysSharkDiver
Character mistake: In the scene on the boat, when Quinn, Hooper and Brody are gathered below, Quinn gives the date about the USS Indianapolis sinking as June 29, 1945. It is actually July 29, 1945. The first atomic bomb wasn't actually detonated until July16, 1945 in Alamogordo, New Mexico making it impossible for the Indianapolis to be delivering the bomb in June.RickManley
Continuity mistake: When Jaws leaves the pond after the attack its fins go below the water as it approaches the bridge, the scene immediately changes to the bridge, the woman is shouting "shark" and we see the fins go below the water again.
Continuity mistake: When the man gets attacked the long shot shows two of the three boys on top of the upturned boat, then we see the leg sink to the bottom with a trainer on, even though the man was bare footed. Then the camera passes the boy in the water and the other two boys are only just climbing up onto the boat.
Revealing mistake: Towards the end, before Quinn is eaten, the shark is "chasing" the boat with 2 barrels. You can see the wire from the boat dragging the barrels off to the right side of the screen.
Character mistake: At the beginning, Sheriff Brody walks onto the "boat" that takes people and, at most, two cars across the water to the mainland. A car joins Brody with 3 men, the medical examiner, the major and the newspaper man. Brody has been told, by the medical examiner, that it was a shark attack that killed the young woman who swam at night (the first death in the film) but now he is being coerced into saying it was a boating accident. Meanwhile, the man who handles the "boat" has already put it in reverse, heading back where they have come from Nonetheless, the mayor says, "You can take us back now." Turning around, he would have seen the folly in his words.kh1616