Yeah, as has been mentioned the thing that REALLY bothered me and will stop me seeing it is this:

"Mous, wanting desperately to show the realism in these various scenes, completely goes over the edge of filmmaking. During the scene where the mute is being cut open and several of his innards removed...the crew actually used a real body of a boy of the actor's age who had been recently killed in a car accident. What you witness in those scenes are real doctors (dressed up to look like the actors) cutting open a real person."

Really sickening stuff. You can read more about it here .