This is the only movie in which
Humphrey Bogart and
Spencer Tracy co-star. Although Tracy and Bogart were good friends, they never appeared in another movie together, as Bogart was tied to a contract with Warner Bros. for much of his career while Tracy was bound first to Fox, and then (most famously) to MGM. When the freelance era arrived in the 1950s and both were free of their studio contracts, the two talked about co-starring together in a picture, but according to Katharine Hepburn, they could never agree on who would get top billing (although Tracy was the more respected thespian, Bogart was more popular at the box office; however, after playing second-fiddle to
Clark Gable for many years at MGM, Tracy wasn't about to accept second billing at that time in his career). Hepburn recalled they considered a suggested compromise that would have created an "X"-shaped credit in which Humphrey Tracy would have co-starred with Spencer Bogart, when read normally.