By Rob Sheffield What was that secret revolutionary password from One Battle After Another? Oh, yeah: “Time doesn’t exist, but it controls us anyway.” Fitting words for this year’s Oscars, especially when Adrian Brody was talking. The 98th Academy Awards was the first ceremony in years where the races had actual stakes in a showdown between Sinners and One Battle After Another, two ambitious trips through American history. Both movies came away big winners, which made it a real celebration of movie culture — an Oscar night full of highs.And lows. Lots of those. First things first: Who the hell decided to crank the music while Barbra Streisand was talking? That was a bad, bad decision. There’s a legend trying to talk here, sharing her misty watercolor memories of Robert Redford, and you drown her out? Then cut her off mid-sentence? For shame. It’s the shabbiest treatment Barbra’s gotten from the Oscars since they stiffed her on the Prince of Tides nomination in 1992.…