Huck, Tom and Jim in the end

 It is pretty troubling that Tom knew all along that Jim was really a free man and then he pretends to make it up to Jim by paying him for his troubles.  Basically Tom hasn't changed throughout the novel, but Huck and Jim have.  Huck's morals have changed as he tried to free Jim and saw Jim on a different level than a slave.  He grew a lot in the novel, so even thought a lot of what he did wasn't really necessary because Jim was free anyway it still helped him to grow inside and change his attitudes somewhat. He is still childish though and we see that when he says he has no interest in being sivilized.   The real Jim came out--a decent, respectable human being--more as he tried to always to the right thing and help and care for others despite how he was being treated.