Plot hole: It's never explicitly stated or shown that the Thing reproduces with each victim until the movie is nearly over (when Palmer infects Windows). Most viewers figure it out from the context, but it's unclear just when and how the characters themselves have come to this conclusion. This was an inadvertent result of an editing decision and a visual goof: there is a deleted scene in which Blair explains much more directly that the Thing multiplies according to how many victims it takes, and in its place in the final film is a scene containing a computer simulation that director John Carpenter acknowledges was a failed attempt at explaining the organism's life cycle.
Nauls disappears and is never seen again. Garry is killed by Blair who turns into the Thing. It destroys MacReady's detonator so instead MacReady throws a stick of dynamite at it. The building explodes. MacReady stumbles to a shack to find Childs there. They take swigs of a bottle of whiskey as the camera shows a wide shot of the camp in flames. Childs and MacReady sit around not knowing if the other is the Thing or not...
Clark: I dunno what the hell's in there, but it's weird and pissed off, whatever it is.
Trivia: The ruins of the American and Norwegian camps are actually the same set. Carpenter saved $750,000 by only filming the one set with different lighting rather than building a second one.
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