One shot that has stuck with me was from behind a set of stairs as Ent crewmembers were marched down.
I believe it was in For the World Is Hollow and I have Touched the Sky, but I might be mistaken.
Yep, it's a very cool shot.
Funny, I thought of that too.
I think there was some sort of an odd shot of Kor's face in Errand of Mercy towards the end of the episode, in his office. I'm not sure if it was just a close up or an odd lens choice, but I was sure it looked different somehow.