What are the differences between the book Great Expectations and the movie?

There are several different movie versions of Great Expectations. The 1946 version follows the book fairly closely, except some characters are left out, such as Orlick (the worker at the smith who probably attacks Pip's sister). In addition, in the movie, Estella gives Pip reason to think that she might eventually love him, while in the novel, Estella's last words to Pip are, "And we will continue friends apart" (page 484). In the novel, Estella never promises to love Pip, so the movie version made a large alteration in the story by suggesting that she did. 

There was also a 1998 movie with Ethan Hawke and Gwyneth Paltrow (set in contemporary times, which was very different from the book) and a 2012 movie of the book. The 2012 version featured Ralph Fiennes as Magwitch. This version restored several of the omissions of the 1946 version, including the complexity of characters such as Biddy and Joe. However, it didn't emphasize Pip's snobbery to the extent that the book did, particularly towards Joe, though it provided a more classic version of the book in film form.