cast
- Marx Brothers
- themselves (Groucho,Chico, Harpo)
- Groucho Marx
- Dr. Hugo Z. Hackenbush
- Chico Marx
- Tony
- Harpo Marx
- Stuffy
- Allan Jones
- Gil Stewart
- Leonard Ceeley
- Whitmore
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- Maureen O'Sullivan
- Judy Standish
- Douglas Dumbrille
- Morgan
- Margaret Dumont
- Mrs. Emily Upjohn
- Esther Muir
- Flo Marlowe
- Sig Rumann
- Dr. Leopold X. Steinberg
- Robert Middlemass
- The Sheriff
- Vivien Fay
- Solo Dancer
- Edward J. Le Saint
- Doctor
- Max Lucke
- Doctor
- Si Jenks
- Messenger
- Frankie Darro
- Morgan's Jockey
- Pat Flaherty
- Detective
- Wilbur Mack
- Judge
- Carole Landis
- Extra
- Jack Norton
- Drunk
- Mary MacLaren
- Nurse
- Charles Trowbridge
- Dr. Wilmerding
- Hooper Atchley
- Race Judge
crew
- Sam Wood
- Director, Producer
- Irving G. Thalberg
- Producer
- Lawrence Weingarten
- Producer
- George Oppenheimer
- Screenwriter
- George Seaton
- Screenwriter
- Robert Pirosh
- Screenwriter
- Joseph Ruttenberg
- Cinematographer
- Bronislau Kaper
- Composer (Music Score)
- Franz Waxman
- Composer (Music Score), Musical Direction/Supervision
- George Bassman
- Composer (Music Score)
- Gus Kahn
- Composer (Music Score)
- Walter Jurmann
- Composer (Music Score)
- Frank E. Hull
- Editor
- Cedric Gibbons
- Art Director
- Edwin B. Willis
- Art Director
- Stanley Rogers
- Art Director
- Max Siegel
- Associate Producer
- Dolly Tree
- Costume Designer
- David Gould
- Choreography
