Maggie DuBois=Nellie Bly?
There's no item in the Trivia section for this, or in the FAQs for the movie. But I think that the character of Maggie DuBois was inspired in part by the real-life journalist Nellie Bly (http://en.wikipedia.org/wiki/Nellie_Bly).
If anyone can confirm this, we can add it to the Trivia section.