1. "God, I Hope I Get it," from A Chorus Line being used liberally ^_^ I know it's mostly a joke, but that doesn't stop it from being awesome.
2. Anna Friel, aka Chuck from Pushing Daisies (and the fact that I recognized her before seeing the end credits).
3. Adam Behr, aka Titanium Chef! as one of the sleeslak elders/skulls. His part was too short for me to catch it the first time around, but when I saw his name in the end credits, I was like, "I know that name, but why?" until it hit me. So that bumped the movie up a notch right there.