von Richter, the Red Baron
It's clearly the Red Baron they mean to be talking about in the film, but they call him von Richter rather than his real name, von Richthofen. Why did they do this? Was it just because the real story of how the baron was shot down was too well known?
Funnily enough, at one point the Basil Rathbone character calls him something like "von Richthofer" -- there was definitely an "o" in there. Why was that? Was that scene filmed very early and they later changed their minds about it? Or did Rathbone just slip? Or did Rathbone disagree with the pronunciation and slip his preference in?