[1] It became well known for its song "The Flies Crawled Up the Window", sung by Hulbert, which was released as a record and proved a major hit.

[4] Policeman Jack (Jack Hulbert) attempts to track down a gang responsible for a smash and grab raid, thereby proving his worth to his disapproving father (Peter Gawthorne), a Scotland Yard detective.

They search a thief's flat and spontaneously break into a silly dance.

All in all, it's a film which has dated badly and which doesn't show off the stars to their best advantage";[6] while TV Guide wrote that though the "Dialog drags a bit, as though it's being read for the stage.

Hulbert saves his performance with a lot of likable charm";[4] and AllMovie called it a "breezy quota quickie", concluding that "Matching Jack Hulbert laugh for laugh is his wife and longtime stage partner Cicely Courteneidge";[7] and Screenonline noted that "Jack's the Boy is acknowledged as one of the team's best films.