Oliver Hirschbiegel talked about how complex it was to bring Princess Diana's story to the silver screen.
"Diana is a very complex character who went through at least three different stages in her life, if not four. The interesting part was these last two years."
Naomi Watts added that they paid meticulous attention to detail, when recreating actual events.
"If we were recreating an event then we would do our best to be exact."
Oliver Hirschbiegel added that the attention to detail was vital to the storytelling process.
"That was crucial to me to reconstruct all the moments that we know in the most authentic, accurate fashion...to make that the cornerstone for people to recognize her and rediscover her."
Naomi Watts, a native Australian, talked about how familiar she was with Princess Diana's life, while adding that there aren't many parallels between her life and Diana's.
"Obviously I was aware of her, but from a distance. I just found her life to be fascinating and her struggles with loneliness and the isolation of fame. There are little moments when I've encountered multiple paparazzi harassing me before, but it's really not any kind of comparison. It would be laughable to even enter into that conversation, there's really no parallel whatsoever other than a few annoying photographers, but it was never-ending for her. She couldn't do anything. From an outsider's point of view, we think how wonderful it is to be a princess...and of course that's not the case. That level of fame would be hard for anyone to survive."
Diana was released November 1st, 2013 and stars Naomi Watts, Naveen Andrews, Douglas Hodge, Geraldine James, Charles Edwards, Daniel Pirrie, Cas Anvar, Juliet Stevenson. The film is directed by Oliver Hirschbiegel.