Stipe sings until he enters into the bar at 3:19, where bar customers sing instead him but with his voice.
When Michael Stipe enters the bar, one of the first bar patrons seen is Charles Dierkop, a prolific character actor with 118 film and TV credits. Among his impressive credits he played the punk that Paul Newman hustles in The Hustler, one of Al Capone's hoods in The St. Valentines Day Massacre, Flat-Nose Curry in Butch Cassidy and The Sundance Kid, Robert Shaw's bodyguard in The Sting and he was a regular as the undercover cop Royster in Police Woman.
Filmed in 3 days. Coincidentally, Apollo 11 took 3 days to reach the moon.
Michael Stipe described the song as being a "sad, funny tribute to a great man", actor/comedian/performance artist Andy Kaufman. Almost a decade later, R.E.M. would lend their music and title to Milos Forman's biopic Man on the Moon (1999), starring Jim Carrey.