During the fight on the boat, one of the soldiers aims at the boat and the camera switches to a view from a scope. The soldier's rifle has no scope.
After the group initially escape from the shark-man, and are on the roof, we see an establishing shot of the building, complete with the rope of clothes that they haven't yet decided to make.
While the group is attempting to get to a boat captained by King's men, we see the boat complete with two of the group hiding astern, then we get a shot of the three men swimming to the boat.
In an early scene, where Dr. Lockhart emerges from the pool after swimming laps, the wider shot shows the pool water completely undisturbed. If she had just emerged, there would be water ripples.
When Whitney Feder sees King's men coming toward him in a car, he drops the phone on the ground in one of the tracks. Then when the camera follows the men and they notice the phone, it's located near the side of the road.
The effect of increased nitrogen in the human bloodstream is known as nitrogen narcosis, which simulates the effects of drunkenness. This can have various health consequences, but immediate explosion is not one of them.
When walking through the greenhouse after the group arrive on the island, Dr. King says the building is a geodesic dome. The glass panels in the background show the building to be a traditional design.
Dr. King comments that there has never been a known instance of a shark with a tumor. This is not true. Although sharks, like all members of the class Chondrichthyes, characterized by a cartilaginous skeleton and placoid scales, have genetically developed the ability to inhibit the secretion of angiogenin, a hormone necessary for tumor growth, the Smithsonian Institution has on record at least 15 instances of elasmobranch tumors; however, only two of those are thought to be malignant.