The one thing I do wonder, though, is say you fix all of your mistakes. You, your personality and maybe your appearence, would be different. So, if you timed traveled. Would the present/future you still be you as you were "orginally"? lol I guess you'd have to see the movie. SPOILERS
He changed some stuff and his parents and his family became rich and happier. So, his parents weren't so strict. In the beginning, before the travel, they won't let him go on a date. After travel, he is allowed. So, in having this freedom all of his life, would he still be the same person? Morally? Would he think the same? Sorry to be so long winded. It just got me thinking. hehe