[...] the Mannix here is not really Mannix but a jumping-off point for a fun and sloppy Coen brothers lampoon that compresses real characters, reimagines others and brings together some of the period's many styles and currents. When we meet him, his studio is funneling money into its latest biblical epic, "Hail, Caesar!," a sort of combination of the real-life films "Ben-Hur" and "The Robe." The magnificence was in the Technicolor camera work and the completely uncynical way in which stars were presented as glorious - such as when George Clooney, as a dimwitted actor playing a centurion, sits on a horse, framed against the sky. Frances McDormand in a subtle tribute to MGM's longtime editor, Margaret Booth, or a boardroom adorned with nothing but framed photos of Wallace Beery. [...] Ralph Fiennes enlivens a couple of scenes as a refined gay director trying to direct a cowboy actor in a drawing-room comedy - the studio era described in a single sentence.