 Frank MorganJ. Daniel 'Dan' Thompson | J. Daniel 'Dan' Thompson |
 Mary HowardMary Thompson | Mary Thompson |
 Billie BurkeBernice Marshall, Boardinghouse Keeper | Bernice Marshall, Boardinghouse Keeper |
 Donald MeekProfessor Charles W. Birdo | Professor Charles W. Birdo |
 Marjorie MainIrma, the Cook | Irma, the Cook |
 Connie GilchristMrs. Evelyn Diamond | Mrs. Evelyn Diamond |
 Bonita GranvilleFrancine 'Frankie' Diamond | Francine 'Frankie' Diamond |
 Dan DaileyEd LeMotte (as Dan Dailey Jr.) | Ed LeMotte (as Dan Dailey Jr.) |
 Andrew Tombes'Doc' Dunbar | 'Doc' Dunbar |
 Walter Catlett'Doc' Skelby | 'Doc' Skelby |
| JJoseph J. GreeneMr. Robert Emmett Ferderber, Private Detective | Mr. Robert Emmett Ferderber, Private Detective |
 Phil SilversMurdock, Side Show Barker | Murdock, Side Show Barker |
 Irving BaconCarriage Driver (uncredited) | Carriage Driver (uncredited) |
 James FlavinPoliceman (uncredited) | Policeman (uncredited) |
| MMayta PalmeraLittle Cairo (uncredited) | Little Cairo (uncredited) |
 Betty FarringtonLittle Lady Buying Soap (uncredited) | Little Lady Buying Soap (uncredited) |
 William TannenActor in Film Scene (uncredited) | Actor in Film Scene (uncredited) |
 Kaaren VerneActress in Film Scene (uncredited) | Actress in Film Scene (uncredited) |