In reality, the Dean Witter training program accepted pretty much everyone who passed the training exam. Still, Gardner scored an impressive 88% on his test.
The homeless people, who worked as extras, received a full day's pay at minimum wage ($8.62/hour) and free catered meals. For some, it was the first money they had made in a while.
Speedcubing champions Tyson Mao, Toby Mao, and Lars Petrus were hired to coach Will Smith to solve a Rubik's Cube in under two minutes.
Based on a true story, though some elements have been changed from the book. For instance, Gardner's internship was not unpaid; he received a modest stipend. He and his son's mother were never married. The son was an infant during the internship.
Christopher, Jr. wore the same outfit throughout the film, except when he was being bathed.
