• Studio publicity in 1941 claimed that Ronald Reagan and Ann Sheridan were scheduled to appear in this film, and Dennis Morgan is mentioned as the third lead. This was never the case, however, and the false story was planted, either by a studio publicist or a press agent for the three other actors, to keep their names in the press. Meanwhile George Raft was angling for the part with Jack L. Warner, but Hal B. Wallis had been assigned to search for what would be Humphrey Bogarts next starring role. He wrote to Warner that he had found the next movie for Bogart and the role was perfect for him. Nobody else was ever considered for the part.
• The Allies invaded Casablanca in real life on 8 November 1942. As the film was not due for release until spring, studio executives suggested it be changed to incorporate the invasion. Warner Bros. chief Jack L. Warner objected, as he thought that an invasion was a subject worth a whole film, not just an epilogue, and that the main story of this film demanded a pre-invasion setting. Eventually he gave in, though, and producer Hal B. Wallis prepared to shoot an epilogue where Humphrey Bogart and Claude Rains hear about the invasion. However, before Rains could travel to the studio for this, David O. Selznick (whose studio owned Bergmans contract) previewed the film and urged Warner to release it unaltered and as fast as possible. Warner agreed and the premiered in New York on November 26. It did not play in Los Angeles until its general release the following January, and hence competed against 1943 films for the Oscars.
• Ingrid Bergmans contract was owned by producer David O. Selznick, and producer Hal B. Wallis sent the films writers, Philip G. Epstein and Julius J. Epstein, to persuade Selznick to loan her to Warner Bros. for the picture. After 20 minutes of describing the plot to Selznick, Julius gave up and said, "Oh, what the hell! Its a lot of shit like Algiers (1938)!" Selznick nodded and agreed to the loan.

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