@Museek
Some say the best movie adaptations are from books that fell short of their potential. Bridges on Madison County gets mentioned but I haven't seen or read either.
Sometimes good movies bear little resemblance to the original, like The Little Mermaid, or make major changes that address concerns of an audience living in another time/place, like Pygmalion/My Fair Lady.
@Museek
Disney’s Mary Poppins and the Eddie Murphy Dr Doolittle cut out a some embarrassingly racist sections in the original books