A small thought about the mythology of the series:

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Harry summons Mother Winter by a couple of names, names she says he "was not wholly stupid in choosing them". Now I know a bit about mythology. Athropos (which I'm guessing is Atropos) is one of the Greek Fates, known as the "chooser of death" or the "inevitable", who cut the threads of life. That fits well enough. Skuld, however, is one of the Norse Norns, similar to the Fates. Skuld is the youngest of the Norns, and signifies "future". Wouldn't Urd ("fate", or "past") have been a better fit? Maybe this was intentional, or maybe just an irrelevant mistake.

I'm kinda in the habit of hunting down any and all literary allusions, especially mythological allusions I find. This one just caught my eye.