When Jaime and Oscar's car is shown arriving at the pier it is wet but moments later when the car comes to a stop everything is dry and in full sun.
Jaime and the divers are communicating whilst underwater but that would not be possible as their breathing apparatus is a tube they have in their mouth (i.e. so they could not even move their lips to speak, let alone the fact they are underwater and could not do so).
When Jaime fights a shark with a metal pole, there is a yellow rope tied around the shark's tail fin.
Visible emulsion-film glitch/splice in the supposedly live-video footage of the first shark-attack on diver wearing the miniature transponder. Obviously 35mm stock-footage of swimming sharks being displayed on a TV monitor.
The diver reports that one of the detector units is operational, yet two assembled units are clearly visible, and the tech-diver had been shown to have calibrated two of the units with his belt-mounted device and curly-cord.