[fanfic] Continuity notes for "The Last Battle"

While I'm still trying to whack the next whofic into shape (man, I suck at plotting), here's what I threatened to do some posts ago: a sort of Cliff's Notes for all the continuity easter eggs in "The Last Battle". Yes, this is pure ego, but maybe some may actually be interested in where it comes from.

( Notes after the cut. Spoilers for several books and episodes. )