Scott was a huge peacenik. Apparently it was a big character stretch for him to play Patton. But he was magnificent. It's my favorite movie and favorite performance of all time.
They had to tone down the profanity... things weren't like they are today. What they did was pushing the envelope as it was. And they certainly captured the General's habit of including some kind of profanity in almost every sentence he uttered.
That must by why they call them "actors". ;-)
There was an A&E special on the making of the film 3 years ago. Had Bradley not been there on the set, the movie may have degenerated into "M.A.S.H Goes to Germany."