This film is inspired by the 1998 bestselling book of the same name by Sylvia Nasar.
The real John Nash visited the set, and Russell Crowe said later that he had been fascinated by the way he moved his hands, and he had tried to do the same thing in the movie. He thought it would help him get into the character.
The equations on the classroom chalk boards in the film are actual equations written by the real life John Nash.
The movie was filmed in sequence in order to help Russell Crowe develop a consistently progressive manner of behavior.
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