Proof

                                                        

Based on the Pulitzer Prize-winning play by David Auburn, "Proof" follows a devoted daughter (Paltrow) who comes to terms with the death of her father (Hopkins) a brilliant mathematician whose genius was crippled by mental insanity -- and is forced to face her own long-harbored fears and emotions. She adjusts to his death with the help of one of her father’s former mathematical students (Gyllenhaal) who searches through her father’s notebooks in the hope of discovering a bit of his old brilliance. While coming to terms with the possibility that his genius, which she has inherited, may come at a painful price, her estranged sister (Davis) arrives to help settle their father’s affairs. (info from Yahoo! Movies)

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Movie Mistakes
When Hal and Catherine are arguing before she goes to the airport, her ponytail switches between going over the front of her shoulder and hanging straight down her back between shots.

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