Continuity: When Hooper climbs into the cage he is not wearing fins, yet when he is lowered in the cage, in the very first shot underwater, he is wearing fins. In the following shots he is not wearing fins, but after the shark destroys the cage and he swims to the bottom of the ocean, he is wearing fins once again.

Revealing: When Charlie and Denherder, the two fishermen, first wrap the link chain around the corner wood piling, the dock they stand on is clearly visible. A bit later when the shark takes their bait, the crossbeams at the base of the dock are actually gone for the stunt.

Visible crew/equipment: During Chrissie's attack, she clings to the buoy and cries, "Oh my God! Oh God!" In the next shot, as she is pulled away from the buoy, a wire (at about the height of the bell) that shimmers in the moonlight and bounces up and down with the buoy, runs from the buoy towards the right of the screen. It is not visible in any other shot.

Visible crew/equipment: Just after the shark's first surprise attack on Hooper's cage, bright blue equipment is visible just past the cage, as the shark swims away.

Visible crew/equipment: When Hooper is underwater in the cage wearing scuba gear, very bright light reflections from the crew are visible on the regulator.

Continuity: At the harbor, just as Brody asks, "Help me get those guys out of the boat, will you?" in the wideshot there are five men standing on the dock and three standing in the boat. Then in the next close-up, there are four on the dock and four in the boat. The one in a black/white check shirt is now at the end of the dock and the one in a black rain slicker, that was standing on the dock, is now suddenly standing in the boat below, at its stern.

Visible crew/equipment: When the bottom half of Quint's body is in the shark's mouth, Quint's fake belly shifts around where the shirt is open and the edge is also noticeable under his shirt.

Continuity: As the shark pulls on the lines tied to the stern cleats, the boat tips to the side and in the wideshot the emblem on one of the air tanks faces the side. Yet, in the next close-up as they hit the ladder, both face front.

Revealing: When the shark takes the fishermen's bait, the attached chain pulls one corner piling at the corner of the small dock. When the dock gives way in the wide shot, another line around the second corner piling visibly pulls it as well, in order for the dock to break apart effectively for the stunt.

Continuity: At Quint's place, he lifts two shark jaws out of the boiling water on the stove, in the close-up. In the next wideshot, the two jaws are positioned differently within the tongs Quint holds.

Continuity: When Quint is telling Brody and Hooper about his body loses during the past, he pulls out a partial denture. In the final scene on the Orca, Quint is shown without this denture, but when he is being eaten by the shark and screams in pain, his teeth are complete again.

Continuity: There is a scene where Chief Brody and his wife are talking about their son's birthday present. She says that he probably won't go in the water after what happened yesterday (the attack on the Kintner boy). The next day is when the shark is caught and Hooper makes a comment about the shark's digestive system being very slow and anything he's eaten within the last 24 hours would probably still be in there. From the earlier scene it would make it 48 hours since the Kintner boy was killed.

Revealing: Towards the end of the movie, when Quint is practically bitten in half, the mechanical shark's rubber teeth bend as it bites down, and they also bend when the shark bites down on the tank.

Revealing: In Bruce's first "full length" scene, as Quint and Hooper are guessing at his length, you can see the mechanical shark passing the Orca has no tail whatsoever.

Revealing: When Quint is gone, the shark bursts through the window of the cabin surprising Brody and in its second close-up, with its jaws wide open, the shark's head moves from left to right of the screen. As it does, the aft side of the cabin set is visible on the left, with the wall conspicuously missing and then at the fore side of the cabin, the window frame is not complete.

Audio problem: While Chrissie is being attacked at the start of the film, when her mouth is visible it is not in sync with her screams.

Continuity: When Brody starts chumming, the stern of the Orca is bloody and the white container is dirty and bloody. When he and Quint watch the shark coming towards them, the container is much cleaner and the pattern of blood on the boat, at the stern, differs.

Other: When Hooper sees the hole in the hull of Ben Gardner's boat, he uses his knife to pry out the shark tooth. The tooth is located at the bottom of the hole, with its flat root side stuck deep in the wood and its pointy side facing up. It is completely impossible for the shark's tooth to become wedged in the wood this way, while he takes a nice bite out of the wood hull.

Continuity: After Hooper and Quint come up from the engine room, there are grease stains all over the front and back of Hooper's blue sweatshirt, that disappear, reappear or keep changing throughout the following shots.

Revealing: At the boathouse, when Hooper cuts open the Tiger shark, this shark is very noticeably different, including its recognizable seams, than the one hanging on the dock earlier.