Continuity mistake: Near the end of the movie, when Oppenheimer is being interrogated in the small room, his lawyer is on the phone (we later find out it's Kitty). In a wide shot, he gives Oppenheimer the phone, and he puts it to his left ear. The next shot is a tight shot of Oppenheimer's face with the phone to his right ear.
Oppenheimer (2023)
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Directed by: Christopher Nolan
Starring: Matt Damon, Emily Blunt, Cillian Murphy
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More mistakes in Oppenheimer
J. Robert Oppenheimer: When I came to you with those calculations, we thought we might start a chain reaction that would destroy the entire world.
Albert Einstein: I remember it well. What of it?
J. Robert Oppenheimer: I believe we did.
Trivia: Robert Downey Jr. declared this was "the best film I've ever been in" at the UK premiere.
Answer: The short version is "no, not really". Much like in the film, the possibility was considered, a lot of calculations were done, and it was agreed by everyone privy to them that the chance was basically zero. Also like in the film: "what do you want from theory alone?" - it couldn't be guaranteed to be absolutely zero, but then the chance of almost anything happening is never absolutely zero. A 1946 report by three of the scientists stated: "whatever the temperature to which a section of the atmosphere may be heated, no self-propagating chain of nuclear reactions is likely to be started. The energy losses to radiation always overcompensate the gains due to the reactions."