Julianne Moore was excellent casting for President Coin. The producers decided, somewhat refreshingly, not to age down the 50ish Coin and Moore was styled in such a way that she closely resembled the book's description. However, her personality in Mockingjay- Part One is almost unrecognisable from the book version of Mockingjay. She is a quietly commanding presence in the film, behaving in a mostly even, if gently forceful way. In the book, she is openly vain and arrogant, so her Machiavellian machinations were not completely unexpected. This may be a case when the film serves a character better by allowing Coin and her motivations to remain enigmatic for longer.