Having recently attempted straight roles in 'Me and the Colonel' and 'The Five Pennies', Danny Kaye's film career was taking a back seat to his activities on stage and TV by the time he returned to comedy to make this, set back in 1944 when he had made his own film debut in the services comedy 'Up in Arms'. Paramount continued to lavish top notch production values (and two Oscar-winning cameramen) and an impressive supporting cast on this as they had on their Bob Hope films. (It also marks one of Diana Dors' last glamorous bad girl roles in Hollywood as a second world war Mata Hari.) But like most Kaye vehicles it does go on.
More farcical than most Kaye fare, the basic plot dates back at least as far as 'Folies Bergere' in 1935 (and probably the silent era), and Kaye himself had already made a version himself ten years before this as 'On the Riviera'. Other comedians ranging from Will Hay to Jerry Lewis have also played their doppelgängers for laughs. The war gave a new lease of life to this situation, with even real life getting in on the act with 'I Was Monty's Double'.