With a title like Jack's the Boy, is it any surprise that the star of this breezy quota quickie is British music-hall favorite Jack Hulbert? The star plays the son of a celebrated Scotland Yard detective, who joins the force in hopes of following his father's footsteps. Unfortunately, Jack is something of a screw-up, and before long he has become the laughing stock of the force.
| Actor | Role |
|---|---|
 Jack HulbertJack Brown | Jack Brown |
 Cicely CourtneidgeMrs. Bobday | Mrs. Bobday |
 Winifred ShotterIvy | Ivy |
 Francis ListerJules Martin | Jules Martin |
 Peter GawthorneMr. Brown | Mr. Brown |
| BBen FieldMr. Bobday | Mr. Bobday |
 Charles FarrellMartin | Martin |
| DDickie ValentineNot listed | Not listed |
 O.B. ClarenceTimkins | Timkins |
| HHal GordonMan with scarf at accident | Man with scarf at accident |
 Arthur RigbyPolice Constable | Police Constable |
 John SingerBoy | Boy |