Oh man, this is one of those scenes that stays with you for a long time. I remember seeing this when I was really young and it scared the bejeezus out of me. It's still frightening! 
The only real difference from script to screen is the "WOLTZ tries to scream; but cannot.  No sound comes out." He starts screaming immediately after seeing the head. I think it might have been better as scripted. It would have been nice to see Woltz's reaction first and then hear the scream. 
Makes me wanna buy 
this.