When Jared, Sam, Amanda, and Bryce are in the pool discussing whether or not to dig for the ship or report the plane, Jared says "One more thing, you don't repeat this to anyone"....and his lips mouth the word Capiche, but it is dubbed over as "OK", and it's done by someone with an accent.
The sounds produced by the Honda 4-stroke outboards on the triple engine offshore boat are not accurate. They are clearly produced by a low-restriction exhaust on an inboard or inboard/outboard engine configuration. The real engines should sound far more quiet and timid.
When Jared and Bryce start wrestling in the water and Jared loses his watch, they both have masks and snorkels on. When they surface when the sharks come, neither has a mask on, and Jared gets a mask from Sam to go back down to get the watch.
Near the end when Sam is fighting with that guy underwater, her hair is pulled back by a rubber band or elastic at the start of the fight and at the end when she is swimming back to the boat. But in the middle of the fight, when he grabs her chest, her hair is loose.
When Sam gets into Jared's boat after he has put his foot through the floor, she takes her sandals off prior to getting in, but in the next shot showing her climbing into the boat, she has her sandals on.
While being chased after having the accident, Jared jumps out of the driver's side of the truck and runs to the passenger side. There's a Land Rover in the background which disappears in the next shot.
Towards the end of the movie Jared, Sam, and Bryce take off after Primo pulls up next to them, you can see the reflection of a camera in the windshield of the truck as they are going down the narrow ally.
During the first dive to look for treasure, the divers use individual underwater propulsion devices spinning in reverse to blow water on the sand to clear the sea floor. Only problem is, none of them move backward when they do so. Blowing that much water at the sea floor would propel them backwards unless they were tethered, which they are not.
When Bryce takes the spear-gun bolt for Jared, you can see the line behind him pulling the spear into his side, and you can see the flesh-colored undergarment he's wearing that the spear goes into, it looks like a bandage around his abdomen.