Glatzer originally heard of a book about Errol Flynn's last love affair The Big Love through his mentor, Jay Presson Allen, the Screenwriter of The Prime of Miss Jean Brodie and Cabaret. The story is told by Flynn's girlfriend's mother, Florence Aadland with co-writer Tedd Thomey and has been praised by the likes of William Styron and W.H. Auden as the ultimate unreliable narrator story. Glatzer and Westmoreland started researching the screenplay in 2003, earning the trust of Florence's daughter, Beverly, and the friendship of author Tedd Thomey and Flynn's chauffeur in his final years, Ronnie Shedlo. They wrote the first draft of the screenplay in 2007 but it was not until 2011, and the attachment of Kevin Kline, that things started to move forward. Killer Films' Christine Vachon and Pam Koffler came on to produce, and Susan Sarandon and Dakota Fanning signed on for the mother-daughter team of Florence and Beverly. Production took place in Atlanta Georgia in 2013. The city's various locations were used to represent Los Angeles, New York, French Equatorial Africa, Cuba and Vancouver.