Hmm....that's interesting Amanda. One thing I always noticed in the movie is that he asks to borrow Jack's lighter when they're in the bar - not a huge thing, I know. But since we see him smoking when he's alone outside the trailer, we know he must have his own matches. I guess we could say it's just a matter of convenience to use Jack's lighter, but maybe subconsciously he's already trying to make some kind of connection with Jack? Or maybe I'm reading too much into it. I'll have to ponder this some more.....
Marie