If you haven't, I'd recommend you see it and that you don't read anymore of this post. Now...
I have just finished watching the movie for the first time (I believe I'll have to go through it again) and I have a few questions...
1.) Why did the guy make up a fake John G. to chase? Was it because he wanted to kill the "Teddy" guy, or that he just wanted a purpose to his life?
2.) I thought there was something special about the mark on his face, but I never saw it. Is there extra footage or something?
3.) Was the main character's wife actually Diabetic?