I just discovered that when the movie Harold and Maude was being cast, the production team thought of assorted European women to play Maude, and Agatha Christie was on the list. (http://en.wikipedia.org/wiki/Harold_and_Maude
). Of course, it's Wikipedia, so there might be no truth in this, but if anybody can track down Nick Dawson's book Being Hal Ashby: Life of a Hollywood Rebel
(2009), it'd be great to check.