Corrected entry: Chief Brody is at the wheel of the boat and Hooper and Quint are trying to fix the engine. Brody can only turn the wheel (in his words) about 3 inches. Just then some of the yellow barrels surface and they stop what they're doing to start the boat to chase the shark. The boat steers fine.
Corrected entry: On the boat, "Orca", there is a giant fishing chair, fastened to the deck of the boat which Captain Quint uses during his first attempt to catch the shark. Shortly after those scenes, the giant chair mysteriously disappears and is never seen again.
Correction: It actually unbolts from the floor, for the rest of the film, as the boat tips and sinks or slants, you can see the hole it left.
Corrected entry: When the Chief is typing the cause of death for the blonde chick in the beginning, if you look, he typed in "Corners" office instead of the "Coroners" office.
Correction: On old typewriters, if you made a spelling error it needed to be whited out and retyped. If Chief Brody decided to just simply leave the spelling error, it is quite a realistic reaction, to just leave it alone. Plus, he may not have even noticed the spelling error as he typed, since he was pre-occupied with the cause of Chrissie's death.
Corrected entry: When Chrissie is being attacked, she has a 5-second pause in being chewed-upon. When it's a hit-and-run attack this is normal (the shark realises it has made a mistake and leaves). Since Chrissie is eaten, we're talking about a bump-and-bite attack, which causes a shark to go into a feeding-frenzy. It is highly unlikely for a shark to let go for even one second in such an event.
Correction: It may be unlikely, but it's not impossible, especially since it's eating prey it has probably not encountered before.
Corrected entry: When Bruce has tipped the boat over on the 4th of July, the man in the boat is trying to get out of the water. We see Bruce swimming up to grab him, the shark's body tilted so that one eye is towards the surface and the other towards the bottom. Shouldn't Bruce's fin be sticking out of the water?
Correction: The shark (a.k.a Bruce, as you call him) is at least five feet below the surface of the water, at which shark's fins cannot reach up to.
Corrected entry: In the movie you only see the shark's fin in the first half of the movie, not the rest of the fish. This was not originally intended, but rather something they were forced to do. One of the first two shark models sank and the other one blew up.
Correction: This was entirely intentional. Steven Spielberg said that he would only direct the movie if the shark wouldn't be revealed for the first hour of the film.
Corrected entry: In the scene where Brody and Quint are loading Hooper's shark cage into the water, Brody appears to have a shirt. In a second angle of the same scene, Brody's shirt is no longer there. The scene then cuts to Hooper in the boat cabin, and then back to the deck. Again, Brody is wearing a shirt. This process occurs a few times during these five or six minutes.
Corrected entry: When Hooper first appears, he arrives on a small boat, but when he and Brody go out to sea to look for the shark, we find out that Hooper also has a larger boat with sophisticated equipment. How did he travel with two different boats? (00:27:00)
Correction: He probably takes the smaller boat out to Amity to see if there really is a problem. When he knows that there is, he goes back to get his better boat. He could also have towed his smaller boat.
Correction: Right after Brody says he can turn the wheel only about three inches, Quint gets a wrench, does some more work, and says to try it again, which means he thought he fixed it, so it is possible the boat now steers fine.