| William Powell | Steve Ireland | 
    
    
      | Myrna Loy | Susan Ireland | 
    
    
      | Gail Patrick | Isobel Kimble Grayson | 
    
    
      | Jack Carson | Ward Willoughby | 
    
    
      | Florence Bates | Mrs. Cooper | 
    
    
      | Sidney Blackmer | Lawyer George Renny | 
    
    
      | Sig Ruman | Dr. Wuthering | 
    
    
      | Vladimir Sokoloff | Dr. David Klugle | 
    
    
      | Donald MacBride | 'Pinky' Grayson | 
    
    
      | Sara Haden | Miss Cecilia Landis | 
    
    
      | Kathleen Lockhart | Mrs. Bristol | 
    
    
      | Fern Emmett | Martha - Ireland's Maid | 
    
    
      | Joseph Crehan | Judge | 
    
    
      | George Meeker | Lawyer DeWest | 
    
    
      | Clarence Muse | Robert - Hat Check Man at Party | 
    
    
      | Elisha Cook Jr. | Joe (elevator operator) | 
    
    
      | Barbara Bedford | Renny's Secretary (uncredited) | 
    
    
      | Aldrich Bowker | Jimmy - the Doorman (uncredited) | 
    
    
      | Edward Hearn | Policeman (uncredited) | 
    
    
      | George Irving | Sanity Hearing Doctor (uncredited) | 
    
    
      | May McAvoy | Sanity Hearing Secretary (uncredited) | 
    
    
      | Ian Wolfe | Sanity Hearing Doctor (uncredited) | 
    
    
      | Wanda Perry | Party Guest (uncredited) | 
    
    
      | Richard Allen | Private Investigator (uncredited) | 
    
    
      | Jimmy Ames | Taxi Driver (uncredited) | 
    
    
      | Joan Barclay | Telephone Operator (uncredited) | 
    
    
      | Mary Bayless | Party Guest (uncredited) | 
    
    
      | Wilson Benge | Tom - Ward's Valet (uncredited) | 
    
    
      | Lulu Mae Bohrman | Party Guest (uncredited) | 
    
    
      | Wade Boteler | Head Private Investigator (uncredited) | 
    
    
      | Ralph Brooks | Party Guest (uncredited) | 
    
    
      | Francis X. Bushman Jr. | Uniformed Sanitarium Guard (uncredited) | 
    
    
      | Naomi Childers | Party Guest (uncredited) | 
    
    
      | Ken Christy | Uniformed Sanitarium Guard (uncredited) | 
    
    
      | Oliver Cross | Party Guest (uncredited) | 
    
    
      | Sayre Dearing | Party Guest (uncredited) | 
    
    
      | Dan Dowling | Party Guest (uncredited) | 
    
    
      | Jay Eaton | Party Guest Getting Rake (uncredited) | 
    
    
      | Harry Fleischmann | Taxi Driver (uncredited) | 
    
    
      | Pat Gleason | Philadelphia Private Investigator (uncredited) | 
    
    
      | George Golden | Party Guest (uncredited) | 
    
    
      | Roy Gordon | Sanity Hearing Doctor (uncredited) | 
    
    
      | Jesse Graves | Bristol's Butler (uncredited) | 
    
    
      | George Guhl | First Taxi Driver (uncredited) | 
    
    
      | Stuart Hall | Party Guest (uncredited) | 
    
    
      | Mahlon Hamilton | Party Guest (uncredited) | 
    
    
      | Eddie Hart | Detroit Private Investigator (uncredited) | 
    
    
      | Selmer Jackson | Doctor at Susan's Apartment (uncredited) | 
    
    
      | Richard Kipling | Party Guest (uncredited) | 
    
    
      | William Lally | Sanitarium Guard (uncredited) | 
    
    
      | George Lollier | Lake Placid Private Investigator (uncredited) | 
    
    
      | George Magrill | Sanitarium Guard (uncredited) | 
    
    
      | Philo McCullough | Cleveland Private Investigator (uncredited) | 
    
    
      | Charles McMurphy | Private Investigator (uncredited) | 
    
    
      | James H. McNamara | Party Guest (uncredited) | 
    
    
      | James Millican | Miami Private Investigator (uncredited) | 
    
    
      | Jack Mulhall | Court Clerk (uncredited) | 
    
    
      | Spec O'Donnell | Anniversary Singer (uncredited) | 
    
    
      | Broderick O'Farrell | Party Guest (uncredited) | 
    
    
      | Paul Palmer | Private Investigator (uncredited) | 
    
    
      | Edward Peil Sr. | Sun Valley Private Investigator (uncredited) | 
    
    
      | Lee Phelps | Uniformed Sanitarium Guard (uncredited) | 
    
    
      | James Pierce | San Francisco Private Investigator (uncredited) | 
    
    
      | Paul Power | Party Guest (uncredited) | 
    
    
      | Bert Roach | Front Desk Clerk (uncredited) | 
    
    
      | Ky Robinson | Cincinnati Private Investigator (uncredited) | 
    
    
      | Byron Shores | Sanity Hearing Doctor (uncredited) | 
    
    
      | Larry Steers | Party Guest Whose Hat is Floating (uncredited) | 
    
    
      | Rudolf Steinboeck | Private Investigator (uncredited) | 
    
    
      | Harry Strang | Police Sgt. Payson (uncredited) | 
    
    
      | Brick Sullivan | Policeman (uncredited) | 
    
    
      | William Tannen | Sanitarium Attendant (uncredited) | 
    
    
      | Edward Van Sloan | Sanity Hearing Doctor (uncredited) | 
    
    
      | Emmett Vogan | Doctor at Susan's Apartment (uncredited) | 
    
    
      | Douglas Wood | Sanity Hearing Doctor (uncredited) | 
    
    
      | Catherine Price |  |