More:
Boppity:
Joel Grey: in "At the Dance" with Zelda Rose
Ruth Buzzi: in the goodnights, in addition to "At the Dance" and the interrogator sketch
Rita Moreno: in "At the Dance" with Zelda Rose
Sandy Duncan: in "Nice Girl Like Me"
Candice Bergen: in the goodnights, in addition to "That Face" and "You've Gotta Have Friends"
Kaye Ballard: in "At the Dance" with Zelda Rose
Steve Martin: in the audience during "Ramblin' Guy"
Bernadette Peters: in "Just One Person"
Petula Clark: in "Tomorrow"
Rita Coolidge & Kris Kristopherson: in cold opening and final number
Roy Clark: in "Pigs in Space"
Alice Cooper: in the goodnights, in addition to UK Spot "Once a Year Day"
Raquel Welch: in the cold opening
Dudley Moore: in "At the Disco Dance"
Kenny Rogers: in "Love Lifted Me"
Lola Falana: in "United We Stand"
Diana Ross: in "Reach Out and Touch"
Gene Kelly: in "Singing in the Rain"
Glenda Jackson: as a pirate
Debbie Harry: in "One Way or Another"
Gladys Knight: in "Friendship Train"
Linda Ronstadt: in "When I Grow Too Old To Dream"
Roger Moore: in the goodnights
Gloat:
Joel Grey: in the goodnights, in addition to "Comedy Tonight", "At the Dance" and "Wilkommen"
Rita Moreno: in "At the Dance" with Mary Louise
Sandy Duncan: in "Nice Girl Like Me"
Candice Bergen: in "You've Gotta Have Friends"
Ethel Merman: in "There's No Business Like Show Business"
Zero Mostel: in the goodnights
Dom DeLuise: in "We Got Us"
Elton John: in the goodnights, in addition to "Benny & The Jets"
Cleo Laine: in the goodnights, in addition to "Everybody Limbo"
John Cleese: in John's final number
Leo Sayer: in the cold opening
Loretta Lynn: in the special opening credits
Raquel Welch: in the goodnights, in addition to the cold opening
Harry Belafonte: in "Turn the World Around"
Linda Lavin: in "Beyond the Blue Horizon"
Dudley Moore: in "At the Disco Dance"
Gene Kelly: in "Singing in the Rain"
Glenda Jackson: as a pirate
Linda Ronstadt: in "When I Grew Too Old To Dream"