Johnny Depp was told by Martin Amis that for research he should spend time with professional darts player Bobby George. He wouldn't need to spend time with any other player - Bobby is the epitome of British darts. Bobby told him that every day was like Christmas Day to him - a reference to how great his life was and the happiness that his success as a darts player had brought. Johnny asked if he could use that line in the film : "am I going to win? Of course I'm going to win. It's Christmas every day for me, innit"
Director Mathew Cullen filed a lawsuit against the producers of this film in September 2015, claiming that they engaged in "fraudulent efforts" to revise the movie without his knowledge. The lawsuit was dismissed in 2018.
The movie was shot in 2013, but its release was delayed due to legal issues. In 2016 producers sued Amber Heard for $10 million, alleging that she reneged on contractual agreements and refused to do nude scenes. She counter-sued in 2017, claiming that producers had employed a body double to make it seem like she had done more nudity than was stipulated in her contract. Despite the friction, Heard can be seen in various states of undress in the film.