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Continuity mistake: When Kelly is on the boat with Hank and the soon to be headless deputy, her green vest (life-jacket) is fully unzipped. When we see her immediately after she's been knocked in the water, her jacket is zipped almost all the way up.
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Continuity mistake: After Jack shoots the dart at the crocodile trapped in the helicopter, it is visible in the animal's jaw. After the attack by the second crocodile, the dart has gone. A moment later it is back again. (01:09:20)