Groucho Marx

Dr. Hugo Z. Hackenbush

Chico Marx

Tony

Harpo Marx

Stuffy

Allan Jones

Gil Stewart

Maureen O'Sullivan

Judy Standish

Margaret Dumont

Emily Upjohn

Sig Ruman

Dr. Leopold X. Steinberg

Leonard Ceeley

Whitmore

Douglass Dumbrille

Morgan

Esther Muir

'Flo' Marlowe

Robert Middlemass

Sheriff

Vivien Fay

Specialty Dancer

Ivie Anderson

Specialty Singer

Gino Corrado

Man Boarding Bus (uncredited)

Bess Flowers

Racetrack Spectator (uncredited)

Bert Moorhouse

Racetrack Spectator (uncredited)

Frank O'Connor

Racetrack Guard (uncredited)

Carole Landis

Party Guest (uncredited)

Etta Moten

Black Singer (uncredited)

Dorothy Dandridge

Singer (uncredited)

Byron Foulger

Racetrack Spectator (uncredited)