Visible crew/equipment: When Oppenheimer and Strauss talk on the lakeshore at the Institute for Advanced Study just after Einstein left, a big stage light is reflected in Strauss' glasses. (00:12:06)
Oppenheimer (2023)
1 visible crew/equipment mistake - chronological order
Directed by: Christopher Nolan
Starring: Matt Damon, Emily Blunt, Cillian Murphy
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.
J. Robert Oppenheimer: They won't fear it until they understand it. And they won't understand it until they've used it. Theory will take you only so far.
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."