Last night’s 30 ROCK was really surprising – They did LIVE shows on both the East and West coasts. They were even able to throw in the “swoosh moments”, when they think about how they reacted in previous situations. They pulled that off by substituting actors (Julia Louis Dreyfus for Tina Fey, which made it even funnier). It was nearly the same, but there were different intros, and a few different jokes here and there.
I think one of the reasons they were able to pull this off is that most of the cast has experience with live performances, whether it be via SNL or Second City.