Leo Davis (clip from Room Service (1938)) (archive footage)
Peerless Pauline (archive footage)
Jeff Wilson (clip from At the Circus (1939)) (archive footage)
Self (archive footage)
Red Baxter (clip from Go West (1940)) (archive footage)
Self (clip from The Jack Benny Program (TV)) (archive footage)
Rosa Castaldi (clip from A Night at the Opera (1935)) (archive footage)
Terry Turner (clip from Go West (1940)) (archive footage)
Alex Conway (archive footage)
Columbus (clip from The Story of Mankind (1957)) (archive footage)
Mrs. Rittenhouse (clip from Animal Crackers (1930)) (archive footage)
Self - host (clip from This is Your Life (TV)) (archive footage)
Self - Groucho Marx's announcer (clip from You Bet Your Life (TV)) (archive footage)
Self - Harpo Marx's wife (archive footage)
Themselves (archive footage)
Laughing Water (clip from The Story of Mankind (1957)) (archive footage)
Self - Groucho Marx's wife (archive footage)
Riccardo Barone (clip from A Night at the Opera (1935)) (archive footage)
Rudolfo Lassparri (clip from A Night at the Opera (1935)) (archive footage)
Self (clip from This is Your Life (TV)) (archive footage)
God's mistress (clip from Skidoo (1968)) (archive footage)
Self - Harpo Marx's son (archive footage)
Self - Groucho Marx's son
Self - Groucho Marx's daughter (archive footage)
Self - Harpo Marx's daughter (archive footage)
Walter Grenham (clip from A Kiss in the Dark (1925)) (archive footage)
Self
Carmen Navarro (clip from Copacabana (1947)) (archive footage)
Judy (clip from A Day at the Races (1937)) (archive footage)
Self - director of Skidoo (archive footage)
Rockwell P. Hunter (clip from Will Success Spoil Rock Hunter? (1957)) (archive footage)
Julie Randall (clip from At the Circus (1939)) (archive footage)
Lucille (clip from Monkey Business (1931)) (archive footage)
Baby's mother on stagecoach (clip from Go West (1940)) (archive footage) (uncredited)
John Carter (clip from At the Circus (1939)) (archive footage) (uncredited)
Mr. Grover (clip from The Big Store (1941)) (archive footage) (uncredited)
Self (archive footage) (uncredited)
Hives (clip from Animal Crackers (1930)) (archive footage) (uncredited)
Eve Wilson (clip from Go West (1940)) (archive footage) (uncredited)
Lulubelle (clip from Go West (1940)) (archive footage) (uncredited)
Flo (clip from A Day at the Races (1937)) (archive footage) (uncredited)
Whitcomb (clip from At the Circus (1939)) (archive footage) (uncredited)
Bouncer (clip from Copacabana (1947)) (archive footage) (uncredited)
Mr. Lee (clip from The House That Shadows Built (1931)) (archive footage) (uncredited)
Melody (clip from Go West (1940)) (archive footage) (uncredited)