There were a lot of very vague allusions with Blofeld . Presumably were are supposed to believe that he has plastic surgery at the drop of a hat, that he uses voice boxes to change his accent, and that he may have kept Bond alive and continued his ruse to find out how much he knew. I vaguely recall that there was at least one example of a black lawman or bounty hunter back in the day. I suppose the premise was tweaked based on that although he would likely have encountered racism. Apparently up to a quarter of cowboys were black but this is rarely seen in movies.