How much of the backstage drama depicted in the new Michelle Williams film 'My Week With Marilyn' -- which chronicles the tumultuous shoot of the 1957 Marilyn Monroe/Laurence Olivier romantic comedy 'The Prince and the Showgirl' -- actually happened? Quite a bit, according to various Monroe and Olivier biographies. If anything, the new movie understates the turmoil surrounding the notoriously insecure and unreliable yet charismatic and witty sex goddess, her frustrated co-star/director Olivier, her overwhelmed new husband Arthur Miller, her manipulative drama coach Paula Strasberg, and star-struck gofer Colin Clark (on whose memoirs 'My Week with Marilyn' is based). It's no wonder that the action behind the camera is better remembered today than the finished product, which plays like a pleasant but inessential trifle, a footnote in the careers of two of the greatest performers in film history. Read on to learn more about what really happened behind the scenes of 'The Prince and the Showgirl,' including events not mentioned in 'My Week with Marilyn.'