Piranha (1978)

Continuity mistake: In the scene where the kids at the Lost River Lake Resort are being attacked by piranha fish, Brogan's daughter Susie is hiding under a blue boat. She tries to lift the boat so she can use it to rescue her friends. It's too heavy for her, so she uses an inflatable boat instead. As she launches the inflatable off the jetty, you can see the blue boat in the water beside the jetty. Moments later, Brogan arrives and picks up the boat from where it was when she was hiding under it.

Trivia: Dick Miller plays the Mayor Buck Gardner, who serves much the same plot purpose as the Mayor Larry Vaughn in the first two JAWS films, in that he insists on keeping the beaches open and dismisses all danger signs. Dick Miller would go on to appear in every single movie ever directed by Joe Dante, right up until Miller's death in 2019.