We were in CA and were able to see this taping live. We were at universal studios on a Monday and were ready to grab tickets and head off to the Tonight Show but realized those were the days when Johnny took Mondays off. So we took the long bus trip back to see it live on Tuesday and boy did that pay off! We were in the second or third tier, so it was easier to watch the monitors than the stage, but what we did see, was Robin Williams zip back and forth in his frenetic style across the full stage so the cameras couldn't keep up! And then Tony Bennett came on! Amazing!!! To see both Robin Williams, and Tony Bennett live at the same time!
Later we saw Good Morning Viêt Nam and Three Men and a Baby which were both playing on Hollywood Blvd. It was all so iconic!
We could not have planned that whole trip any better if we had spent months figuring it out. And to this day, more than 30 years later, he still has vivid as the day I saw them.