Continuity mistake: At the start, Tillman is reaching into the water with his right arm, as seen from the crocodile's perspective. But seen from above surface, he is reaching with his left arm.
Continuity mistake: Near the end of the movie, after the sheriff saves his son and the girl by shooting the croc with the grenade launcher, there is a shot of them walking towards the crazy woman's house. He now has a regular rifle, and he does not have the launcher on him. But when he sets the trap for the next croc, he has the launcher back again.
Continuity mistake: As the Sherrif comes to save his son and girlfriend they are cornered by 2 crocs. The Sheriff blows one up then magically the other disappears.
Continuity mistake: Every time someone falls in the water, from the surface the water is shown as muddy and murky, but from underneath the water is crystal clear.