| Person | Type | Job | Role(s) |
|---|---|---|---|
 Ben Lewis | Crew | Editing | Editor |
 Cedric Gibbons | Crew | Art | Art Direction |
 Charles Lederer | Crew | Writing | Screenplay |
David Hertz | Crew | Writing | Story, Screenplay |
 David Snell | Crew | Sound | Original Music Composer |
 Douglas Shearer | Crew | Sound | Sound Director, Recording Supervision |
 Edwin B. Willis | Crew | Art | Set Decoration |
 Jack Conway | Crew | Directing | Director |
Jerry Bresler | Crew | Production | Unit Manager |
Lennie Hayton | Crew | Sound | Original Music Composer |
 Pandro S. Berman | Crew | Production | Producer |
Paul Groesse | Crew | Art | Assistant Art Director |
Ray June | Crew | Camera | Director of Photography |
Robert A. Golden | Crew | Directing | Assistant Director |
William H. Daniels | Crew | Camera | Director of Photography |
William Ludwig | Crew | Writing | Story, Screenplay |
 Aldrich Bowker | Cast | Actor | Jimmy - the Doorman (uncredited) |
 Barbara Bedford | Cast | Actress | Renny's Secretary (uncredited) |
 Bert Roach | Cast | Actor | Front Desk Clerk (uncredited) |
Brick Sullivan | Cast | Actor | Policeman (uncredited) |
 Broderick O'Farrell | Cast | Actor | Party Guest (uncredited) |
Byron Shores | Cast | Actor | Sanity Hearing Doctor (uncredited) |
Charles McMurphy | Cast | Actor | Private Investigator (uncredited) |
 Clarence Muse | Cast | Actor | Robert - Hat Check Man at Party |
Dan Dowling | Cast | Party Guest (uncredited) | |
 Donald MacBride | Cast | Actor | 'Pinky' Grayson |
 Douglas Wood | Cast | Actor | Sanity Hearing Doctor (uncredited) |
Eddie Hart | Cast | Actor | Detroit Private Investigator (uncredited) |
 Edward Hearn | Cast | Actor | Policeman (uncredited) |
 Edward Peil Sr. | Cast | Actor | Sun Valley Private Investigator (uncredited) |
 Edward Van Sloan | Cast | Actor | Sanity Hearing Doctor (uncredited) |
 Elisha Cook Jr. | Cast | Actor | Joe (elevator operator) |
 Emmett Vogan | Cast | Actor | Doctor at Susan's Apartment (uncredited) |
 Fern Emmett | Cast | Actress | Martha - Ireland's Maid |
 Florence Bates | Cast | Actress | Mrs. Cooper |
 Francis X. Bushman Jr. | Cast | Actor | Uniformed Sanitarium Guard (uncredited) |
 Gail Patrick | Cast | Actress | Isobel Kimble Grayson |
 George Guhl | Cast | Actor | First Taxi Driver (uncredited) |
 George Irving | Cast | Actor | Sanity Hearing Doctor (uncredited) |
George Lollier | Cast | Lake Placid Private Investigator (uncredited) | |
 George Magrill | Cast | Actor | Sanitarium Guard (uncredited) |
 George Meeker | Cast | Actor | Lawyer DeWest |
Harry Fleischmann | Cast | Taxi Driver (uncredited) | |
 Harry Strang | Cast | Actor | Police Sgt. Payson (uncredited) |
 Ian Wolfe | Cast | Actor | Sanity Hearing Doctor (uncredited) |
 Jack Carson | Cast | Actor | Ward Willoughby |
 Jack Mulhall | Cast | Actor | Court Clerk (uncredited) |
James H. McNamara | Cast | Party Guest (uncredited) | |
 James Millican | Cast | Actor | Miami Private Investigator (uncredited) |
 James Pierce | Cast | Actor | San Francisco Private Investigator (uncredited) |
 Jay Eaton | Cast | Actor | Party Guest Getting Rake (uncredited) |
 Jesse Graves | Cast | Actor | Bristol's Butler (uncredited) |
Jimmy Ames | Cast | Actor | Taxi Driver (uncredited) |
 Joan Barclay | Cast | Actress | Telephone Operator (uncredited) |
 Joseph Crehan | Cast | Actor | Judge |
 Kathleen Lockhart | Cast | Actress | Mrs. Bristol |
Ken Christy | Cast | Actor | Uniformed Sanitarium Guard (uncredited) |
Ky Robinson | Cast | Cincinnati Private Investigator (uncredited) | |
 Larry Steers | Cast | Actor | Party Guest Whose Hat is Floating (uncredited) |
 Lee Phelps | Cast | Actor | Uniformed Sanitarium Guard (uncredited) |
Lulu Mae Bohrman | Cast | Actress | Party Guest (uncredited) |
 Mahlon Hamilton | Cast | Actor | Party Guest (uncredited) |
 May McAvoy | Cast | Actress | Sanity Hearing Secretary (uncredited) |
 Myrna Loy | Cast | Actress | Susan Ireland |
 Naomi Childers | Cast | Actress | Party Guest (uncredited) |
Oliver Cross | Cast | Actor | Party Guest (uncredited) |
 Pat Gleason | Cast | Actor | Philadelphia Private Investigator (uncredited) |
Paul Power | Cast | Actor | Party Guest (uncredited) |
 Philo McCullough | Cast | Actor | Cleveland Private Investigator (uncredited) |
 Ralph Brooks | Cast | Actor | Party Guest (uncredited) |
Richard Allen | Cast | Actor | Private Investigator (uncredited) |
Richard Kipling | Cast | Party Guest (uncredited) | |
 Roy Gordon | Cast | Actor | Sanity Hearing Doctor (uncredited) |
Rudolf Steinboeck | Cast | Private Investigator (uncredited) | |
 Sara Haden | Cast | Actress | Miss Cecilia Landis |
 Sayre Dearing | Cast | Actor | Party Guest (uncredited) |
 Selmer Jackson | Cast | Actor | Doctor at Susan's Apartment (uncredited) |
 Sidney Blackmer | Cast | Actor | Lawyer George Renny |
 Sig Ruman | Cast | Actor | Dr. Wuthering |
 Spec O'Donnell | Cast | Actor | Anniversary Singer (uncredited) |
 Stuart Hall | Cast | Actor | Party Guest (uncredited) |
 Vladimir Sokoloff | Cast | Actor | Dr. David Klugle |
 Wade Boteler | Cast | Actor | Head Private Investigator (uncredited) |
Wanda Perry | Cast | Actress | Party Guest (uncredited) |
William Lally | Cast | Actor | Sanitarium Guard (uncredited) |
 William Powell | Cast | Actor | Steve Ireland |
 William Tannen | Cast | Actor | Sanitarium Attendant (uncredited) |
 Wilson Benge | Cast | Actor | Tom - Ward's Valet (uncredited) |
Catherine Price | Cast | Actress | |
Richard Allen | Cast | Actor | Private Investigator (uncredited) |
Paul Palmer | Cast | Private Investigator (uncredited) | |
George Golden | Cast | Party Guest (uncredited) | |
Mary Bayless | Cast | Actress | Party Guest (uncredited) |
| Person | Type | Job | Role(s) |
