error in the movie (spoilers)
At exactly 1 hour and 16 minutes into the movie, (when the 4 are in the cave), the guy Shawn tells the 2 girls to take the unconcious girl and run, as they do he sets his chain saw into a spider and kills it... he looks rather smug.. but as you can see, you can actually see the guys legs right through the spider.
here are some caps of it:
http://i11.photobucket.com/albums/a164/bex_sparkle/PDVD_002.jpg
http://i11.photobucket.com/albums/a164/bex_sparkle/PDVD_003.jpg
http://i11.photobucket.com/albums/a164/bex_sparkle/PDVD_001.jpg
http://i11.photobucket.com/albums/a164/bex_sparkle/PDVD_000.jpg
"The finalised alligning of objects, cease to rest my mind."