- Studio publicity in 1941 claimed that 'Ronald Reagan' and Ann Sheridan were scheduled to appear in Casablanca, and Dennis Morgan is mentioned as the third lead. But this was never the case 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 Wallis had been assigned to search for what would be Humphrey Bogart's next starring role. He wrote to Jack Warner that he had found the next movie for Bogart and that the role was perfect for him. Nobody else was ever considered for the part.
- 'Michele Morgan' asked for $55,000, but Wallis refused to pay it when he could get Ingrid Bergman for $25,000. Bergman was available only because she had been rejected for For Whom the Bell Tolls (1943); see trivia for that film.
- Producer Hal B. Wallis considered Hedy Lamarr for the role of Ilsa, but she was then under contract to MGM (who wouldn't release her) and didn't want to work with an unfinished script anyway. Lamarr later portrayed Ilsa in a 1944 radio show based on movie scripts, "Lux Radio Theater". At the time, both Bergman and Bogart were overseas entertaining the troops. Rick was played on radio by Alan Ladd.
- Producer Hal B. Wallis nearly made the character Sam a female. Hazel Scott, Lena Horne, and Ella Fitzgerald were considered for the role.
- Paul Henreid was loaned to Warners for the role of Victor Lazlo by Selznick International pictures against his will. He was concerned that playing a secondary character would ruin his career as a leading romantic lead.
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