Groucho Marx as Attorney J. Cheever Loophole

Chico Marx as Antonio Pirelli

Harpo Marx as 'Punchy'

Kenny Baker as Jeff Wilson

Florence Rice as Julie Randall

Eve Arden as Peerless Pauline

Margaret Dumont as Mrs. Suzanna Dukesbury

Nat Pendleton as Goliath

Fritz Feld as Jardinet

James Burke as John Carter

Jerry Maren as Little Professor Atom (as Jerry Marenghi)

Barnett Parker as Whitcomb

Irving Bacon as Telegraph Clerk (uncredited)

Willie Best as Redcap (uncredited)

Frank Orth as Chef in Diner (uncredited)

John Binns as Old Man (uncredited)

Henry Blair as Undetermined Role (uncredited)

George Bookasta as Member of Quarttete (uncredited)

James Conaty as Party Guest (uncredited)

Frank Darien as Telegrapher (uncredited)

Dudley Dickerson as Singer / Dancer - 'Swingali' (uncredited)

Betsy Gay as Undetermined Role (uncredited)

Charles Gemora as Gibraltar (uncredited)

John George as Man Leaving Diner (uncredited)

Bobby Hale as Train Passenger (uncredited)

Harry Hayden as Conductor (uncredited)

Shep Houghton as Circus Patron (uncredited)

Payne B. Johnson as Boy at Circus (uncredited)

Carl M. Leviness as Club Car Train Passenger (uncredited)

Buck Mack as Checkers Player (uncredited)

Murdock MacQuarrie as Attendant (uncredited)

Matt McHugh as Cabbie (uncredited)

Edmund Mortimer as Governor (uncredited)

Forbes Murray as Captain (uncredited)

Emory Parnell as Ringmaster (uncredited)

Lillian Randolph as Black Woman - 'Swingali' (uncredited)

Larry Steers as Party Guest (uncredited)

Fred Walburn as Undetermined Role (uncredited)

Robert Winkler as Undetermined Role (uncredited)

Hazel Dohlman as Party Guest (uncredited)

Stuart Hall as Circus Patron (uncredited)