Big time spoiler.
I thought the scene of JRO reading “I am become death, the destroyer of worlds,” from the Bhagavad-Gita, to Jean Tatlock was inane. Oppenheimer did think of these lines, he said, immediately after Trinity, but he didn’t say them out loud. So Nolan has him say these lines years before Trinity, to Jean Tatlock, the first night they were together? So we need to ask, who or what is the destroyer of worlds? Jean herself, as a prediction of Oppenheimer’s downfall? Communism? Sex? Oppenheimer himself, in relation to Jean’s world? Or Oppenheimer himself, as a prediction of his involvement in Trinity and its aftermath? Boy, that was a really badly designed scene, I thought.