Character mistake: On the death certificate for Chrissie, the shark's first victim, the date of death is July 1st. But later, on the reward paper posted by the boy's mother, it says that the date of Alex's death was June 29th. Alex died after Chrissie, not before. Also, the form refers to the coroner as the "corner."
Character mistake: During one of the shark scares at the beach, Chief Brody is running along the shoreline telling everyone to get out of the water. There are several frames where the Chief and a man with a moustache are at the water's edge. If you look closely you will notice that the man is laughing and other people laugh as well.
Character mistake: After Hooper cuts open the Tiger shark, he tells Brody that it isn't the shark. He adds "you still got a hell of a fish out there, with a mouth about this big." He indicates size of the bite by holding his hands about 2 feet apart. This estimate is based on the bite marks on the first victim. Of course, later we see the shark's bite radius is much larger, around 3 to 4 feet. Hooper is a shark expert and should be able to more accurately determine bite radius.
Character mistake: Captain Quint tells Hooper and Brody that the USS Indianapolis delivered "the Hiroshima bomb" in 1945. This is a myth that has persisted for decades and right up to the present. To prevent it from being lost in one piece, the Hiroshima bomb was actually delivered in pieces by various means to Tinian Island, where the parts were reassembled before it was carried aboard the Enola Gay to its target in Japan. The USS Indianapolis delivered only the detonator for the bomb.
Character mistake: Chief Brody and Hooper go to the wharf to dissect a large tiger shark and examine the contents of its stomach. Finding nothing unusual, Hooper recommends they go offshore that night to search for the real killer shark because "he's a night feeder." Coming from a marine biologist, that remark really makes no sense. Hooper knew that, in addition to eating Chrissie the midnight swimmer, the shark also ate Pippin (the black Labrador retriever) and the Kintner boy in the middle of the day at a public beach. Based on all available evidence, the shark was no more likely to feed at night than in broad daylight.
Add timeCharles Austin Miller
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.
Character mistake: When Chief Brody finds Chrissie's remains on the beach it is the middle of the day. Yet when Chief Brody is filling out Chrissie's death certificate, he lists Date/Time Death Discovered on 2nd July 1974 at 10:20pm. It would have to be dark for that to have happened.
Character mistake: In the beginning of the movie, Chrissy goes swimming on the night of July 1. Her remains were found the next morning on July 2. The police report that Brody types up states that the incident happened at 11:50 p.m. On July 1 and that Chrissy's remains were found at 10:20 p.m. On July 2 and not in the a.m. As the movie shows. Also on the police report, it states that Chrissy was removed to the "CORNERS OFFICE" and not the coroner's office.