As Andy Kaufman's comedy writer, he often posed as Kaufman's alter ego,
"Tony Clifton", with Kaufman's approval. Many personal appearances
wherein Kaufman was supposed to turn up as "Clifton" was actually Zmuda
instead.
Robin Williams always felt a little guilty about all the good things he was given, so he had a real place in his heart for people who were homeless and suffering. He and Whoopi and Billy not only did the show [Comic Relief USA], they would go to shelters together and meet the people they were helping. They were the real thing.