The woman(SPOILERS)
Personally i enjoyed the movie quite a bit, and thought Adrien Brody's acting was great. A few times we see his girlfriend , but all of those are hallucinations or dreams. However, near the ending of the movie we see him fighting and eventually killing her. Surely this was a hallucination as well, right?
The flashback showed him being taken by the bankrobbers and the girlfriend couldn't do anything. So she can't have been in that forest as well. Each time he got these hallucinations, it was made obvious that it was just that...hallucinations. However after 'killing' her, it wasn't all that clear at all if this was real or not. Of course this was the intention, but i'm just curious about what others think.