What are the Differences between Anastasia the movie and the book the movie is based on?

There really is no book on Anastasia but the differences between the movie and the true story of Anastasia Romanov is that her family wasn't killed when she was 8 years old, she was 17 when she and her family were exicuted in the "House of Special Purpose's" basement. But her Grandmother did escape the tragidy and live in Paris until she moved to Canada a few years later.