Yellow Canary

"Put her into Brixton jail with all the other 18Bs", says an annoyed lady diner on seeing Sally. This references Regulation 18B of the Defence (General) Regulations 1939, which allowed for those suspected of being Nazi sympathizers to be interned; some indeed being housed in H.M.P. Brixton.

The first time the cigarette case is opened, to signify the owner's Nazi sympathies, the engraved swastika is reversed, the open-ended bars pointing downward. At the end of the film when the same cigarette case is opened, the engraved swastika has been corrected. Obviously 2 separate cases were used - one correct, one not.

The MPPDA seal appears on the opening RKO Radio logo on the American print instead of its usual place in the credits.