Just ran into a dawngaurd (Soliah) traveling on the road. Her line was "Sorry, but I am urgent business for the Dawnguard. Stand aside." What made it mildly interesting is that she was galloping along on horseback. Rarely have I seen npc's using horses, and then always walking. The only ones I have seen are the nobleman and his guard (guard on foot) and an occasional hunter. I wish my followers could use a horse. That would be nice.
I find it rather bizarre that she did not acknowledge me as a fellow Dawnguard. I am also annoyed by the imperial prisoner transport groups that don't recognize me as a Legate of the Legion. Whenever they tell me to "move along citizen" I feel like bringing them up on charges of insubordination.

Edit: whoops, forgot about Mr. Headless.