Dr. Hugo Z. Hackenbush
Groucho Marx
Tony
Chico Marx
Sheriff
Robert Middlemass
Specialty Dancer
Vivien Fay
Specialty Singer
Ivie Anderson
Man Boarding Bus (uncredited)
Gino Corrado
Racetrack Spectator (uncredited)
Bess Flowers
Bert Moorhouse
Racetrack Guard (uncredited)
Frank O'Connor
Party Guest (uncredited)
Carole Landis
Black Singer (uncredited)
Etta Moten
Singer (uncredited)
Dorothy Dandridge
Stuffy
Harpo Marx
Byron Foulger
Gil Stewart
Allan Jones
Judy Standish
Maureen O'Sullivan
Emily Upjohn
Margaret Dumont
Dr. Leopold X. Steinberg
Sig Ruman
Whitmore
Leonard Ceeley
Morgan
Douglass Dumbrille
'Flo' Marlowe
Esther Muir
Screenplay
George Seaton
Story
Producer
Irving Thalberg
Sound Director
Douglas Shearer
Original Music Composer
Franz Waxman
Sam Wood
Director
Art Department Assistant
Edwin B. Willis
Art Direction
Cedric Gibbons
Lawrence Weingarten
Director of Photography
Joseph Ruttenberg
Editor
Frank E. Hull
George Oppenheimer
Robert Pirosh
Assistant Director
Robert A. Golden
Leonard Smith
Wardrobe Designer
Dolly Tree