On the whole I thought the exhibit was really wonderful. It focused on Henson's body of work, not just the obvious hits of the Muppet Show and Sesame Street.
The exhibit featured not only muppets but numerous pieces of concept art for actual puppets and storyboards for commercials and movie shorts.
At regular intervals throughout the exhibit you could sit and watch commercials and behind the scenes footage of the shows.
My favorite commercial was one for the La choy Dragon. Adorably ridiculous dragon tears up a grocery store and advertises bad chinese food in a can!
http://www.youtube.com/watch?v=4bfdaR4xMeU
What impressed me the most about the whole exhibit was the glimpse into the scope of Henson's imagination. I think an imagination is a beautiful thing. The fact that he was able to share his imagination with so many people and touch so many people's lives with his work is incredible.