| 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 | |
| Leonard Ceeley | ... | Whitmore | |
| Douglass Dumbrille | ... | J.D. Morgan | |
| Esther Muir | ... | Flo Marlowe | |
| Sig Ruman | ... | Dr. Leopold X. Steinberg (as Sig Rumann) | |
| Robert Middlemass | ... | Sheriff | |
| Vivien Fay | ... | Speciality Dancer (as Vivian Fay & Her Ballet) | |
| Ivie Anderson | ... | Specialty Singer | |
| The Crinoline Choir | ... | Musical Ensemble | |
| rest of cast listed alphabetically: | |||
| Hooper Atchley | ... | Race judge (uncredited) | |
| King Baggot | ... | Race Track Official Starter (uncredited) | |
| Kenny Baker | ... | Party Guest (uncredited) | |
| Vivian Barry | ... | Telephone girl (uncredited) | |
| Barbara Bedford | ... | Secretary (uncredited) | |
| Edna Bennett | ... | Nurse (uncredited) | |
| Troy Brown Jr. | ... | Black singer (uncredited) | |
| Ben Carter | ... | Black singer (uncredited) | |
| Jacqueline Clancy | ... | Child (uncredited) | |
| Gino Corrado | ... | Man Boarding Bus (uncredited) | |
| DeForest Covan | ... | Black singer (uncredited) | |
| George Cowl | ... | Racetrack Spectator (uncredited) | |
| Jack Daley | ... | Racetrack Spectator (uncredited) | |
| Dorothy Dandridge | ... | Black singer (uncredited) | |
| Vivian Dandridge | ... | Black singer (uncredited) | |
| Frankie Darro | ... | Morgan's jockey (uncredited) | |
| Frank Dawson | ... | Doctor (uncredited) | |
| Dudley Dickerson | ... | Wheelchair attendant (uncredited) | |
| Billy Dooley | ... | Race Track Bugler (uncredited) | |
| Edward Earle | ... | Race judge (uncredited) | |
| Richard Farnsworth | ... | Jockey (uncredited) | |
| Pat Flaherty | ... | Detective with sheriff (uncredited) | |
| Bess Flowers | ... | Racetrack Spectator (uncredited) | |
| Ray Flynn | ... | Racetrack Spectator (uncredited) | |
| Byron Foulger | ... | Racetrack Spectator (uncredited) | |
| Jack George | ... | Musician (uncredited) | |
| John Hiestand | ... | Radio announcer (uncredited) | |
| Leyland Hodgson | ... | Policeman at Racetrack (uncredited) | |
| Arthur Stuart Hull | ... | Racetrack Spectator (uncredited) | |
| John Hyams | ... | Judge (uncredited) | |
| Si Jenks | ... | Messenger (uncredited) | |
| Jack W. Johnston | ... | Racetrack Spectator (uncredited) | |
| Darby Jones | ... | Black singer (uncredited) | |
| Etta Jones | ... | Black singer (uncredited) | |
| Jack Kenny | ... | Racetrack Spectator (uncredited) | |
| Edith Kingdon | ... | Old woman (uncredited) | |
| Carole Landis | ... | Party Guest (uncredited) | |
| Harry Lash | ... | Racetrack Spectator (uncredited) | |
| Edward LeSaint | ... | Doctor (uncredited) | |
| Max Lucke | ... | Doctor (uncredited) | |
| Wilbur Mack | ... | Race judge (uncredited) | |
| Mary MacLaren | ... | Nurse (uncredited) | |
| Alex Melesh | ... | Racetrack Spectator (uncredited) | |
| Bert Moorhouse | ... | Racetrack Spectator (uncredited) | |
| Edmund Mortimer | ... | Party Guest (uncredited) | |
| Henry Mowbray | ... | Man for Hat Business (uncredited) | |
| Field Norton | ... | Party Guest (uncredited) | |
| Jack Norton | ... | Drunk (uncredited) | |
| Frank O'Connor | ... | Racetrack Guard (uncredited) | |
| Victor Potel | ... | Horn blower (uncredited) | |
| Russ Powell | ... | Racetrack Spectator (uncredited) | |
| James Quinn | ... | Racetrack Spectator (uncredited) | |
| Gus Robinson | ... | Black singer (uncredited) | |
| Phillips Smalley | ... | Racing Spectator with Wrong Hat (uncredited) | |
| Charles Trowbridge | ... | Dr. Wilmerding (uncredited) | |
| Elizabeth Williams | ... | Racetrack Spectator (uncredited) | |
| Harry Wilson | ... | Detective with sheriff (uncredited) | |
| Buck Woods | ... | Black singer (uncredited) | |
Directed by | |||
| Sam Wood | |||
Writing credits | ||
| Robert Pirosh | (story) & | |
| George Seaton | (story) | |
| Robert Pirosh | (screenplay) & | |
| George Seaton | (screenplay) & | |
| George Oppenheimer | (screenplay) | |
Produced by | |||
| Max Siegel | .... | associate producer | |
| Sam Wood | .... | producer | |
| Irving Thalberg | .... | producer (uncredited) | |
| Lawrence Weingarten | .... | producer (uncredited) | |
Original Music by | |||
| Walter Jurmann | |||
| Bronislau Kaper | |||
| Franz Waxman | (uncredited) | ||
Cinematography by | |||
| Joseph Ruttenberg | |||
Film Editing by | |||
| Frank E. Hull | |||
Art Direction by | |||
| Cedric Gibbons | |||
Art Department | |||
| Stan Rogers | .... | associate art director | |
| Edwin B. Willis | .... | associate art director | |
Sound Department | |||
| Douglas Shearer | .... | recording director | |
Stunts | |||
| Richard Farnsworth | .... | stunts | |
Camera and Electrical Department | |||
| Ted Wurtenberg | .... | gaffer (uncredited) | |
Costume and Wardrobe Department | |||
| Dolly Tree | .... | wardrober | |
Music Department | |||
| Leo Arnaud | .... | music arranger: choral and orchestral | |
| George Bassman | .... | orchestrator | |
| Roger Edens | .... | music arranger | |
| Paul Marquardt | .... | orchestrator | |
| Merrill Pye | .... | musical presentation | |
| Franz Waxman | .... | musical director | |
| Wayne Allen | .... | orchestrator (uncredited) | |
| George Bassman | .... | composer: additional music (uncredited) | |
| Roger Edens | .... | composer: additional music (uncredited) | |
Other crew | |||
| Dave Gould | .... | choreographer | |
| Carl 'Major' Roup | .... | script clerk (uncredited) | |
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| Duck Soup | A Night at the Opera | Gone with the Wind | Monkey Business | The Notebook |
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| Full cast and crew | Company credits | External reviews |
| IMDb Comedy section | IMDb USA section | Add this title to MyMovies |
Overall, this is a good Marx Brothers feature that is sometimes a little uneven, but that looks pretty good as long as you don't compare it with their very best pictures. The basic setup is amusing, and it provides some good material for the cast to work with. Groucho, Chico, and Harpo all get their moments, with Margaret Dumont once again joining in the fun.
The sanitarium setting and Groucho's attempt to run it are used pretty well.
There is a very funny scene when one of the heavies tries to check on Groucho's credentials, and another one when Dr. Hackenbush has to compete with an outside expert (Sig Ruman, who is always fun in this kind of role) for Dumont's confidence.
Not all of it works quite that well, and one or two of the musical numbers could have been skipped with no loss at all. But there are plenty of good moments and creative sequences, and a satisfyingly chaotic finale as good as those in any of their films.