Visible crew/equipment: When Amanda is tangled in all the ropes and straps in the plane you see a diver behind her trying to hide from the camera man.
Continuity mistake: In the airport scene Scott Caan introduces his new "girl" to Paul Walker and Jessica Alba. In the background behind Paul you see a long-haired brunette wearing a strapless shirt walk out of the terminal and continue past the camera. The shot changes to a wide angle of the four main characters, and a second or so after the change you see the same brunette come out of the terminal again.
Continuity mistake: When they are pulling the cannon onto the boat, about ten minutes prior to the end, there is no water on the cannon, it is completely dry though it just came out of the water.
Continuity mistake: During the scene when Paul Walker goes back into the water to find his watch, just before he finds the plane he is wearing it, but when he siwms off towards the plane he does not have the watch on.
Continuity mistake: When Jessica Alba is going from the pier to the boat to check on Paul Walker after his leg went through the boat, it shows her take off her flip flops. But when it cuts to where she is on the boat she has the flops on.
Audio problem: Notice when anything heavy hits the bottom of the ocean it makes a loud thud. The bottom is soft sand and wouldn't make noise.
Plot hole: When the group first finds the plane, they are all able to hold their breath long enough to descend, search the plane and resurface. Yet later in the movie, even though Amanda can get a full breath of air from the air pocket in the plane, she can't hold her breath long enough to swim to the surface and has to be rescued by Jared.
Visible crew/equipment: During the scene where Paul is mad at Scott for not telling him he had no money to buy a boat, the mic wire is visible outside Paul's collar.
Continuity mistake: When they first discover the wreck and they are pulling pieces of treasure up to the rear deck of the boat, Jessica's fins change from the clear fins to a set of blue ones without her changing or getting out of the water.
Revealing mistake: When the guys are on the jet skis, when they are showing off, you can tell they are stunt doubles.
Revealing mistake: As the guys are showing off on the jet skis, Amanda is recording them with a camcorder. You can see it's in the OFF mode.
Continuity mistake: When Paul Walker is removing water from his boat, he is pulling the cord for a pump, then falls in ankle-high water. The shot then pans back and he is sitting on a dry deck.
Other mistake: In the scene where Jessica Alba has just cut off the guy's hand she was cuffed to and she is running around the boat, the handcuffs don't have a spot of blood on them.
Continuity mistake: When Amanda looks into the airplane before going in her regulator mouth piece is in her mouth. Next shot shows the regulator dangling on the side of her body when entering the plane hole. (00:32:03)
Continuity mistake: Amanda finds a treasure piece in her metal strainer and then sets off to the airplane where the strainer is empty, without the treasure piece that she just found moments ago. (00:31:04 - 00:31:46)
Visible crew/equipment: When Scott Caan's arm is caught under the cannon and Paul Walker lifts it to get him out, when the cannon is dropped back to the ocean bottom an air bubble floats to the surface. As the camera follows the air bubble a camera man in the water is visible on the right side of the screen next to the boat.
Continuity mistake: The scene where Paul Walker and Scott Cann are wrestling in the water when the sharks show up, Paul Walker is wearing a diver's mask when they start. Then it cuts to a different angle and he is not wearing it, and then asks Jessica Alba to throw him his mask when he surfaces.
