The film is full of delightful in-jokes about its subject and the people who lived through the era: Jean Hagen's Lina Lamont is a burlesque of silent-movie sex symbol Clara Bow, whose decidedly urban style of diction never really fit her image or what the public wanted, while Millard Mitchell's R.F. Simpson was a gently jocular satire of Freed himself, who could never quite visualize the elaborate musical numbers whose scripts and budgets he was approving as producer. Donald O'Connor's Cosmo Brown was an onscreen stand-in for men like Franz Waxman and dozens of other musicians, who moved from writing arrangements or conducting the major theater orchestras to heading the music departments of the studios. The resulting musical, in addition to offering a brace of memorable songs and performances (with a startlingly sultry featured spot for Cyd Charisse in the "Broadway Melody" sequence, as a bonus), gave audiences a short-course pop-history lesson about how the movies learned to talk, sin...