Annie Mumolo was hired to write the script for the movie, based on a true story.
But once director David O. Rusell of Silver Linings Playbook and American Hustle fame joined the project, Mumolo found herself being shunted to the side.
“The Joy movie was a very heartbreaking experience for me, and I had to just sort of separate because of that aspect of things.
In the end, the screenplay credit was given to David O. Russell, while Mumolo had to share a “story by” credit with him as well.