It turns out … spoilers don’t spoil anything. In fact, a new study suggests that spoilers can actually increase our enjoyment of literature. Although we’ve long assumed that the suspense makes the story—we keep on reading because we don’t know what happens next—this new research suggests that the tension actually detracts from our enjoyment.

Not so much 'debunked', but this article calls out Krakauer on a number of conclusions and omissions from his book (and the subsequent movie). To summarize: the poison/moldy seeds theory doesn't hold water, and McCandless probably just simply starved to death. McCandless had money and a map with him on his final trek, but the book and movie omit this. Also, one of the final self-portrait photographs might have a clue as to the "injury" alluded to in his final note: one sleeve of his shirt looks armless.