Paul Thomas Anderson won big at the Oscars with “One Battle After Another” but “Sinners” also landed major wins. But in the shadow of those big movies, actor Amy Madigan ended a 40-year wait between nomination and winning for “Weapons,” and the show honored Rob Reiner and Robert Redford in a long in memoriam section. Anderson, one of the most respected filmmakers of his generation, finally won an Oscar. Then he won another. Then he won the biggest one. There were also two stunning musical performances — “I Lied to You” from “Sinners” and “Golden” from “KPop Demon Hunters.”