 Robert CummingsGeorge Petty, aka Andrew 'Andy' Tapp | George Petty, aka Andrew 'Andy' Tapp |
 Joan CaulfieldProf. Victoria Braymore | Prof. Victoria Braymore |
 Elsa LanchesterDr. Crutcher | Dr. Crutcher |
 Melville CooperBeardsley (Petty's butler, aka Uncle Ben) | Beardsley (Petty's butler, aka Uncle Ben) |
 Audrey LongMrs. Connie Manton Dezlow | Mrs. Connie Manton Dezlow |
 Mary WickesProf. Whitman | Prof. Whitman |
 Frank OrthMoody (process server) | Moody (process server) |
 John RidgelyPatrolman | Patrolman |
 Dorothy AbbottDecember Petty Girl (uncredited) | December Petty Girl (uncredited) |
 Gino CorradoBrush and Easel Waiter (uncredited) | Brush and Easel Waiter (uncredited) |
 Pat FlahertyPoliceman #2 (uncredited) | Policeman #2 (uncredited) |
 James GriffithRoyal Roof Orchestra Leader (uncredited) | Royal Roof Orchestra Leader (uncredited) |
 Tippi HedrenIce Box Petty Girl (uncredited) | Ice Box Petty Girl (uncredited) |
 MovitaCarmelita Moray (uncredited) | Carmelita Moray (uncredited) |
 Ray TealPoliceman #1 (uncredited) | Policeman #1 (uncredited) |
 Ian WolfePresident Webb (uncredited) | President Webb (uncredited) |
 Lyn ThomasPatti McKenzie (uncredited) | Patti McKenzie (uncredited) |
 Jean SpanglerNightclub Patron (uncredited) | Nightclub Patron (uncredited) |
