Retroactive Continuity, Esi.
Anyway, I've found a way to convince the two statements to support each other by making another statement later on, which patches up the gap pretty nicely. I think I gave it too much thought earlier, frankly, considering it was still a relatively small point, but I think it's still a good thing to discuss.
To an extent, I might be holding myself to the wrong standard again. That sort of continuity error in, say, a published novel is unacceptable, because you read it all at once and the problem is obvious, not to mention this is after several drafts. DRK, on the other hand, is not quite at that level of quality control, and besides that the two offending sentences are months apart in terms of when they were written. Which brings up another question - if the writers here were to write a full blown novel, how would their system of writing change? How would they go about second, third drafts? Planning?
Sect: I have already done that once in PLotSS, though that was for a glaring error in physics and geometry. And yes, I freaked out like nuts over that as well. >_>