One of the few films to employ a flashback within a flashback within a flashback. This film is often seen as an attempt to recapture the magic of Casablanca (1942), which many of this film's key players were a part. Some "usual suspects" include director Michael Curtiz, stars Humphrey Bogart and Claude Rains, supporting and bit players Peter Lorre, Sydney Greenstreet, Helmut Dantine and Corinna Mura, writer Casey Robinson, composer Max Steiner, producer Hal B. Wallis and executive producer Jack L. Warner (both films were made by Warner Bros.). Also, Michèle Morgan was originally cast as Ilsa in "Casablanca", but her salary demand was too big, so Ingrid Bergman was cast instead.