Plot: Guests: --The cast of ""Hair"" - ""Aquarius""/""Let the Sun Shine In"" --Peter Nero - ""Mrs. Robinson"" (instrumental) --Steve Lawrence & Eydie Gorme --The Lennon Sisters - ""On A Clear Day"" --The Muppets --Charlie Callas (stand-up comedian) --Dickie Henderson (stand-up comedian) - does a Frank Sinatra imitation