13. The real Lawrence H. Summers called the film's portrayal of his meeting with the Winkelvoss twins "fairly accurate". He went on to say "I've heard it said that I can be arrogant. If that's true, I surely was on that occasion. One of the things you learn as a college president is that if an undergraduate is wearing a tie and jacket on Thursday afternoon at three o'clock, there are two possibilities. One is that they're looking for a job and have an interview; the other is that they are an asshole. This was the latter case. Rarely, have I encountered such swagger, and I tried to respond in kind."
14. Andrew Garfield came into rehearsal with a copy of Economics for Dummies. Inspired by that move, Jesse Eisenberg bought C++ for Dummies. According to Eisenberg, both he and Garfield read the introductions of their books and then put them down.
15. As part of his research, Jesse Eisenberg read a copy of Mark Zuckerberg's college application. Zuckerberg's essay focused on his love of fencing, so Eisenberg took a couple of lessons. He quickly realized it affected his posture and the way he moved, and applied that knowledge to his portrayal of the character.
16. Andrew Garfield was originally asked to audition for Mark Zuckerberg but David Fincher decided he was too good at wearing his heart on his sleeve to play such an emotionally guarded character. Garfield found it helpful to go from reading for Mark to reading for Eduardo, because he felt that Eduardo tried to understand Mark through Mark's point of view.
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