Guests (from Hollywood): --Herman's Hermits - ""Just A Little Bit Better"" and ""Jezebel"" --Marvin Gaye - sings ""Take This Heart of Mine"" (live singing over pre-recorded music track) --Duke Ellington and his Orchestra - medley (""Cat Opener,"" ""Do Nothing till You Hear From Me,"" ""Don't Get Around Much Anymore,"" Caravan,"" ""Satin Doll."") and ""Take the 'A' Train"" --Helen Hayes (actress) - does a monologue in character as Harriet Beecher Stowe --Richard Pryor (stand-up comedy) - imitates the Ali vs. Liston fight, school plays, etc. --The Smothers Brothers - comedy routine: ""Lonesome Traveler,"" ""Church Bell Song,"" childhood memories.   --Myron Cohen (comedian) --The Manuela Vargas Ballet Troupe (Spanish dancers) --Audience bows: Samuel W. Gordon (Los Angeles Mayor), Dave Chasen Other guest (scheduled to appear): --Ginny Tiu (singer-pianist)