Something I've been thinking of as of late; working out the cosmic retcon of Dawn's intro in season 5. Like what role she played in the rebooted history we didn't see.
We can assume Faith held her and Joyce hostage together in This Year's Girl, and she comments about Ted in I Was Made to Love You. And then there's the comic False Memories, which I have certain events as a headcanon; Dawn followed Buffy down into the Master's lair in Prophecy Girl, and helped Xander and Angel save her. And in Innocence, she, not Willow, was the one Angelus manhandled and choked.
I'd love to hear what the rest of you think.