Audio problem: When the helicopter lands and the teenagers cheer you can hear dialogue from later in the film in the background. Several times you hear "Sean, catch the rope." which they yell later in the movie.
Audio problem: When the shark breaks the katamaran and most of the teens fall into the water by Cable Junction, one of the girls can be heard screaming in the underwater shot of the shark. That is perhaps fine, but the sound of someone screaming as heard under water continues over a few clips from above the surface.