Corrected entry: In a deleted scene, when they burn Karl, it is obvious that the stuntman is wearing a fake "Karl" mask.
Corrected entry: Through this film (and its predecessor) it is established that the creature imitates its victims perfectly, having all of their knowledge and memory. At the end, when the female lead tells the male lead she knew he was human because of his earring, he reaches for the wrong ear, confirming he is The Thing. Even if The Thing couldn't reproduce the earring, it would have known which ear it was supposed to be in.Jason Hoffman
Corrected entry: I can just barely understand the logic behind an Antarctic research station having a small number of handguns and at least one assault rifle. But flamethrowers and grenades? No reason, other than to drive the plot.