Groucho Marx

Attorney J. Cheever Loophole

Chico Marx

Antonio Pirelli

Harpo Marx

'Punchy'

Kenny Baker

Jeff Wilson

Florence Rice

Julie Randall

Eve Arden

Peerless Pauline

Margaret Dumont

Mrs. Suzanna Dukesbury

Nat Pendleton

Goliath

Fritz Feld

Jardinet

James Burke

John Carter

Jerry Maren

Little Professor Atom (as Jerry Marenghi)

Barnett Parker

Whitcomb

Irving Bacon

Telegraph Clerk (uncredited)

Willie Best

Redcap (uncredited)

Frank Orth

Chef in Diner (uncredited)