It’s not unusual to see an acceptance speech at an awards show fall prey to the lure of oversharing. What’s less common is to see a speech that reveals more than it says out loud. But that’s just what happened on Sunday night when the filmmakers and stars of “Emilia Pérez” took to the stage to accept the Golden Globe award for best motion picture — comedy or musical.

The film’s director, Jacques Audiard, had already spilled his guts earlier that night in an awkwardly translated, rather endless speech he made to accept the award for best foreign-language film. Now Audiard, looking like an aging golfer in his pork-pie hat, was out of words. “Clearly, I’ve not prepared anything,” he said through a translator. In what seemed a spontaneous gesture, he motioned his lead performer, the trans actress Karla Sofía Gascón, to come forward, and she...