Scrooge in the movie is a very old guy who needs a Cane to walk but in the movie it just says he is an old man. It also says that when the bells rang he jumped up but in the movie is is just sitting in his chair staring and waiting for whatever is coming. Maybe you did not notice but also in the movie Scrooge goes from grumpy to happy really quick but in the book he goes really slow.
Also bob is a very slim man in the book but a very big man and he is short. He is also a very jolly man in the movie