Jerry Lewis

Clayton Poole

Marilyn Maxwell

Carla Naples

Connie Stevens

Sandra Naples

Salvatore Baccaloni

Gigi 'Papa' Naples

Reginald Gardiner

Harold Hermann

Ida Moore

Miss Bessie

Gary Lewis

Young Clayton

Isobel Elsom

Mrs. Van Cleeve

James Gleason

Doc Simpkins

Hans Conried

Mr. Wright

Hope Emerson

Mrs. Rogers

Alex Gerry

Judge Jenkins

Mary Treen

Nurse

Judy Franklin

Young Carla

Will Wright

Fire Chief (uncredited)