Christmas Invasion, more thoughts

Well, I've just re-watched The Christmas Invasion with the commentary (Russell T Davis, Juile wassername, and someone-else-i-forget). I ended up having to go my last-resort method, which was to play the episode on my main PC, and the commentary on my laptop, since each application wanted to hog the soundcard. I also kept on pausing one and the other, because I wasn't certain I had them lined up correctly, and then I'd over-correct, and so on. Oh well.
( here be spoilers )

I think Russell T Davis did a much better job of conveying "yes, this is the Doctor" in the Children In Need special, than he did in the whole of the Christmas Invasion.