Love the Watchtower reveal scene. It's a really dramatic moment, the way the loud notes pop in at just the right time and you see the Cylons recognize it. Tigh's reaction is just fantastic.
I didn't realize it was the same song until I came in here. I thought it was another song they recognized. I'm chalking it up to how loooooong it's been since that episode and the fact that BSG is the only place I've heard it.
I also didn't see imaginary piano man coming. I thought he was a real person paralleling Kara's father, like Romo Lampkin was a parallel of Apollo's grandfather.