What are the differences between the movie and the book?

Couple of subtle but very significant differences. Eg- Hanna learns to read in prison and reads about the holocaust and begins to feel guilty, 'lets herself go'.

Dropped from the film because they didn't want the idea that Hanna had found redemption or found out what she did was wrong.

Maybe shouldn't have been dropped from the film because most people think she was remorseful during the trial.

In addition to her repentance at the end, the book has her represented by a lawyer at the trial who makes a, though not perfect in Michael's opinion, effort to save her. In the book Michael is sickened with hepatitis rather than scarlet fever when he first meets Hanna. Also the daughter does not come with him to Hanna's grave in the end. It is Michael's father, not the professor, who "authorizes" him to keep silent about Hanna's illiteracy. The book makes it clear that Michael's decision to conceal Hanna's illiteracy is because he believes that is what she would want him to do. The fight with the mother near the end is not to be found in the book. The family's relationship in general is better. The book also made Hanna out to be more competent generally, in that before she left him in 1958 she accepted that their relationship was probably unsustainable, and didn't feel resentment toward him for it. There are also two major scenes of their relationship that for some reason weren't included: one where Hanna visits Michael's house and is enchanted by his father's library, another where she becomes enraged when Michael trivializes education. Also the fight in the hotel on their holiday escalates to violence in the book making it less of a surprise that Hanna might have a dark past.