Robert De Niro actually teared up during the scene when Pat Sr. tells Pat he wished he was closer to him, which was not scripted.
Bradley Cooper and Jennifer Lawrence spent weeks practicing the climactic ballroom dance routine with choreographer Mandy Moore. "None of that was improvised, absolutely not," asserts Lawrence. "I'm a terrible dancer, so I would never have been able to do any of that. When it finally came together, that scene really was just as fun as it feels." Lawrence even mentioned that compared to her, Cooper took to dancing quite naturally, when in fact it's her character Tiffany that's supposed to be the experienced dancer, and Pat, the amateur.
David O. Russell was drawn to the story because of the family relationships, and also because of the connection to his own son Matthew Antonio Grillo Russell, who is bipolar and has OCD.
Among its 8 Academy Award nominations, this film became the first to earn nods in all four acting categories since Reds (1981) and the first "Big Five" (Best Picture, Best Actor, Best Actress, Best Director, Best Writing) nominee since Million Dollar Baby (2004). Director David O. Russell repeated the same rare feat the following year with American Hustle (2013).
The Russian title of this film translates as "My Boyfriend Is a Psycho".
The results of Eagles and Phillies games mentioned in the movie are all real and all took place in 2008.
Tiffany's appearance was originally more "goth", Jennifer Lawrence dyed her hair black and wore heavy dark makeup for costume tests but Harvey Weinstein disapproved, so the goth elements were toned down. Lawrence was also advised by David O. Russell to gain weight for the role.|