Corrected entry: Though the movie takes place in midsummer, many of the townfolks are dressed for much cooler weather.
Corrected entry: At the end of the film, where Brody finally kills the shark, he was only a couple of feet from it when it exploded. Brody should have been blown sky high.
Corrected entry: When Chief Brody fires the shot that hits the air tank and blows up the shark, one second before the explosion the shark is not moving.
Corrected entry: 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. (00:44:30)
Corrected entry: When Brody fills out the report on the girl found on the beach he has an orange towel on his right shoulder. It is still there under his jacket when he walks down the road. When it switches to the front shot it's gone.
Corrected entry: Hooper says he can't poison Bruce because his skin is too thick and he'll have to go in the water and poke him in the mouth. However, when Brody stabs him in the head with the gaff, it leaves several bloody holes. It's just a bit too convenient for the plot to be believable that Hooper would choose to go into the water with a creature so powerful and dangerous (as opposed to at least trying to drug him from the surface first). And he had enough of the drug to try more than once: he fills one syringe from a good sized bottle of the stuff.
Corrected entry: At the end of the movie, Brody picks up a floating oxygen tank, revealing that it's empty. Full tanks would sink from their weight, not float.
Corrected entry: In the scene towards the end of the film, when they are trying to outrun the shark back to land (when Quint says something like: we'll get him in the shallows and drown him) you see a shot from the rear of the boat, and in the distance you can clearly see the shore line. But after that point in the movie, you never see the shore, even when they are swimming back at the very end.