Back when the movie first came out, the magazine CINEFANTASTIQUE did a big story on it. They had a writer on set a long time and he did a big write up on behind the scenes stuff. I haven't read it for years (I still have the issue packed away somewhere) but I remember some tings he talked about. A lot didn't make it into the movie. He talked about full long fight scenes in the early pit fights that we got seconds of....lots and lots of severed limbs and heads on set. One thing he told that always stood out was.....one day on set he made some kind of remark about things being fake....Sven Ole Thorson heard him, walked over and handed him a horseshoe. The writer said I looked at it, felt it in my hand, and asked Sven what it was for. He said Sven then took it from him, and twisted the iron horseshoe with just his hands....then walked off laughing.