| Person | Type | Job | Role(s) |
|---|---|---|---|
 Alex Troffey | Crew | Editing | Editor |
Charles Belden | Crew | Writing | Writer |
Earl Derr Biggers | Crew | Writing | Characters |
 H. Bruce Humberstone | Crew | Directing | Director |
Herschel McCoy | Crew | Costume & Make-Up | Costume Design |
Lucien N. Andriot | Crew | Camera | Director of Photography |
 Oscar Levant | Crew | Sound | Music |
 Sol M. Wurtzel | Crew | Production | Executive Producer |
 Adolph Faylauer | Cast | Actor | Opera Spectator (uncredited) |
 Benson Fong | Cast | Actor | Opera Supernumerary (uncredited) |
 Boris Karloff | Cast | Actor | Gravelle |
 Bud Geary | Cast | Actor | Cop (uncredited) |
 Charlotte Henry | Cast | Actress | Mlle. Kitty |
 Frank Conroy | Cast | Actor | Mr. Whitely |
Frank Fanning | Cast | Cop (uncredited) | |
 Gregory Gaye | Cast | Actor | Enrico Borelli |
 Guy Usher | Cast | Actor | Inspector Regan |
Harrison Greene | Cast | Actor | Detective (uncredited) |
 J. C. Fowler | Cast | Opera Spectator (uncredited) | |
 Jim Farley | Cast | Actor | Detective (uncredited) |
 Joan Woodbury | Cast | Actress | Dancer in Opera (uncredited) |
 John Bleifer | Cast | Actor | Murdered Orderly (uncredited) |
 Julia Griffith | Cast | Actress | Opera Spectator (uncredited) |
 Keye Luke | Cast | Actor | Lee Chan |
Larry Fisher | Cast | Cop (uncredited) | |
 Marc Lawrence | Cast | Actor | Undetermined Minor Role (uncredited) (unconfirmed) |
 Margaret Irving | Cast | Actress | Mme. Lilli Rochelle |
 Maurice Cass | Cast | Actor | Mr. Arnold |
Myrta Bonillas | Cast | Villager in Opera (uncredited) | |
 Nedda Harrigan | Cast | Actress | Mme. Lucretia Borelli |
 Otto Fries | Cast | Actor | Innkeeper (uncredited) |
Patrick Cunning | Cast | Actor | Villager in Opera (uncredited) |
Raymond Brown | Cast | Actor | Guard (uncredited) |
 Stanley Blystone | Cast | Actor | Backstage Cop Who Shoots Gravelle (uncredited) |
 Thomas Beck | Cast | Actor | Phil Childers |
 Tom McGuire | Cast | Actor | Pop Morris - Stage Doorman |
 Warner Oland | Cast | Actor | Charlie Chan |
 William Bailey | Cast | Actor | Detective (uncredited) |
 William Demarest | Cast | Actor | Sergeant Kelly |
 Herschel Graham | Cast | Actor | Villager in Opera (uncredited) |
Zari Elmassian | Cast | Mme. Rochelle (singing voice) (uncredited) | |
Charles Bancroft | Cast | Soldier in Opera (uncredited) | |
Carita Crawford | Cast | Dancer in Opera (uncredited) | |
Milton Gowman | Cast | Villager in Opera (uncredited) | |
| Person | Type | Job | Role(s) |
