Continuity mistake: Twice, the croc stops several feet from its victim and opens its mouth. In the next shot the victim is in the croc's mouth, though it is sitting in the same place. Does the crocodile have a tractor beam?
Continuity mistake: In the scene where Claire, Brady and Duncan have just jumped from a blazing boat, and the Sherriff has been eaten, look and you will see that the boat then has no flames on it when they get on land.
Continuity mistake: Towards the end, when the unconvincing-looking crocodile flicks the guy over its head, it somehow manages to backtrack about twenty feet in less than a second to swallow him as he falls.