Jazz Boat

The "Jazz Boat" used in the film was the MV Royal Sovereign. It was built in 1948 as a passenger excursion vessel for the General Steam Navigation Company (note the "G.S.N.C." on the gang's sweaters near the end of the film). In 1967 it was converted to an automobile and passenger ferry. In 1973 it moved to the Mediterranean and was renamed "Ischia" serving the Naples to Ischia Island route. It was sold for scrap in 2007.

When Al Mulock as "The Dancer" is carried to the ship's rail and tossed overboard, the stuntman who takes the fall into the Thames, although in costume, has long dark hair, whilst Mulock's character has distinctive short, blond curly hair.