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