The first shot of Hasselhoff as young David runs to him is flopped; his badge is backwards.
When Maddy escapes a piranha attack her jacket is wet but in the next shot it is dry.
When Barry is cleaning up around the pool in the beginning of the film, a green bag of chips fly away. He then throws his trash-picker in attempt to catch it. In the next scene the bag that is pinned to the wall is now brown.
The orientation of the cinder block Barry uses to keep himself underwater while rescuing Maddy changes. When he first goes in the water it is horizontal (with him holding both ends). When he gets to the bottom of the pool he is holding it vertically (holding only one end). And when he gets to Maddy it is horizontal again (holding both ends).
Big Dave is shown pouring what is supposed to be liquid chlorine into the water circulation system, and then igniting it. First, the chlorine used in pools and water parks comes in solid form (pellets or discs). And second, chlorine gas is not flammable.
When Barry is cleaning up around the pool near the beginning of the film, the clear wire pulling the bag of chips that flies away is visible.
When Hasselhoff is looking out of his motel room window, the crane holding the camera is reflected in the window.
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