They actually announced before the film there was some racial words used in a historical context for accuracy........ simple and put the issue to bed.... Odd no one complains about Blazing saddles though isn't it.
The low flying, I read an article on the filming, they did the practice low shots in daylight flying at 60 FT as per the raid, but it looked awfully high on film so the director got them to reshoot it all at 30 FT!