My most favorite revelation in a long time: Zuko's mother was descended from Avatar Roku! OMFG YES! That means Zuko's related to both Sozen and the past Avatar! THAT IS SO AWESOME. :D
I loved the backstory. In fact, the one thing that bothered me was the editing. The cuts between scenes were so abrupt. Especially the beginning- they just threw us into the story so quickly, without any build-up at all, that for a minute or so I was just thinking "wait...what?" But story-wise and animation-wise, great episode.
Though...that part with Aang in the Spirit World and the Gaang watching him was kinda......uh.......yeah. Wasn't needed. O.o;;
Also, apparently the UK got more new episodes and they're up on the internet now or something? I dunno. I'm just gonna keep watching the episodes on TV, so please don't spoil me. :/
EDIT: Nickelodeon's Shocktober thing looks seriously lame. When I was a kid, I watched "Are You Afraid of the Dark?" when I wanted something scary.
EDIT 2: Oh man...now I'm suddenly feeling nostalgic for the Goosebumps books.
EDIT 3: WOAH. YOU KNOW WHAT WOULD BE AWESOME? IF TOPH IS THE REINCARNATION OF ROKU'S EARTHBENDING TEACHER.