Well let me take you back to a couple scenes in Hostel.. Paxton gets his fingers cut off, than the torturer gets his leg cut off by a chainsaw.. This follows up with a scene of corpses being carried away on a push cart. Their is a scene where Paxtons friend is being autopsied on the table, the eye goo scene, when the Japanese girl jumps in front of the train and blood splatters on the crowd. Paxton runs over the evil chick with his car and drags her along, the mobster gets his head smashed in by a rock from the Bubble Gum gang, and the doctor gets his fingers chopped off and than his neck slit...
You see their is ALOT more than you remember.. Its just that for some reason or another it doesn't really stick with you like it does with other movies.. My thinking is that all the gore in this movie has meaning. Its just not blatantly thrown on the screen for the sake of having it there.
Getting to your question all films shown at film festivals are basically unrated and uncensored. If you remember awhile back both Saw and Hostel were screen in a Canadian film festival and both of them were gorier in the festival and cut for U.S. distribution.