At the beginning when the divers are jumping out of the helicopter their suits are black or orange. In the water, most of them have blue suits.
When showing us the divers at the beginning before the initial shark attack, we can clearly see that two divers have double tanks. However, later shots show all the divers with single tanks.
Some of the shark scenes are used more than once throughout most of the film. For example, the beach scene when people are being devoured, has a scene in which sharks are swimming and one shark snaps at the water. This scene appears several times in different areas of the film. Some shark scenes are even shown once then again immediately after it ends.
At 7:18 minutes when Billy jumps out of the helicopter, for a brief moment he is shown in the air, from the rear, without air tanks on his back.
At minute 7:39 when Jimmy Wagner jumps out of the helicopter, he too is shown without tanks on his back.
In the opening scene the divers are wearing Octos, a breathing device that must be inserted into the mouth and make speaking near impossible. However, the divers are able to communicate clearly as though they are wearing radio headsets. On top of that, none of the divers are even wearing any type of listening device just standard wet suit hoods.
Sharks do not growl underwater (or above water for that matter). These sharks growl several times during this film.
Great White Sharks do not hunt in packs, schools or indulge in any kind of pack behavior (none that has been proven although some has been speculated).
In several of the up close shots of the sharks, there is only one row of teeth in the "sharks". Real sharks have several rows.
At minute 11:54, the ship wreck from 1712 the divers are at, clearly shows a metal ladder with metal rungs, none of which would have been left after 300 plus years in the ocean.
The scenes in this movie where surfers are attacked are the same as in Shark Attack 2 (2000). You can even see Thorsten Kaye's body up to his shoulders when one of the surfers is being helped by paramedics on the beach.
In the first shark attack Jimmy is swimming above water after several people were attacked. A side of a pool was visible. Also there was indoor fluorescent lights.
When Jimmy Wagner is in the helicopter dropping the explosives in the water one of the camera crew's hand appear pushing one of the bombs in the chopper