Damien Chazelle's new film "Babylon," a 189-minute drunken love letter to 1920s Hollywood, bears very little resemblance to actual Hollywood history. It follows a pair of fictional would-be silent movie stars named Manuel Torres (Diego Calva) and Nellie LeRoy (Margot Robbie) as they traverse the gloriously depraved, days-long, drug-and-urine-soaked house parties where all the industry higher-ups hang out. Crossing their paths on the way down is Jack Conrad (Brad Pitt), a once-big star who is...