Oppenheimer director Christopher Nolan has revealed one of the most disturbing lines from the movie was an improvisation. In the scene where J. Robert Oppenheimer and other government officials are discussing where in Japan they will drop the atomic bomb, Henry Stimson (James Remar) crosses off Kyoto from the list.
He says this is because of its cultural significance, as well as the fact he and his wife honeymooned there. It turns out the latter part of this was improvised by Remar as it was something he’d drawn from his research into Stimson's life.
