Incidentally, there are enough references to assume MGM is the basis for Capitol Pictures.
The Coens have laced Hail, Caesar! with enough visuals and double entendres that beg for multiple viewings to appreciate them all. Look for Dolph Lundgren as a submarine commander; overhead swim shots straight out of Busby Berkeley; Veronica Osorio suggesting Carmen Miranda; and the seldom seen lately Christopher Lambert. Frances McDormand has a choice slapstick bit as a cigarette smoking film editor. As a topper, Michael Gambon narrates this Coen opus.