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Pre-production news items in Hollywood Reporter indicate that George Sidney was originally set to direct this film. A August 29, 1946 Hollywood Reporter news item noted that production on the film was suspended for about ten days, beginning on 28 Aug, so that Jimmy Durante could complete his scenes in This Time for Keeps (see below). The musical number "The Song's Gotta Come from the Heart" was one of Jimmy Durante's signature songs. Andr Previn, who provided the piano solos for the film, received his first onscreen credit for It Happened in Brooklyn. Previn, who was only seventeen at the time of production, had been a member of the M-G-M music department for several years prior to his work on this film. Previn went on to work as both a composer and conductor for many films and won a number of Academy Awards before becoming principal conductor of the London Symphony and other internationally known orchestras.