enjoyed it but am still confused

Rating: 9/10 (13 September 2001)

this was a very compelling movie to watch, and very difficult to follow. i guess i need to watch it again to fully understand everything. Not sure if Joe P's character was telling him the truth or not. I guess my general perception was that Guy P's character was just a nutball and that a good deal of the movie was fantasy in his mind. Any help?