Glad you upgraded to a better mic. It helps.
Nice job on this review, Ian. I can understand why you felt the ending was a bit too jingoistic. But I don't think it mars the overall film. For kicks you should check out GUNG HO starring Randolph Scott-- total propaganda.
The comments about Lang sneaking into the editing room were interesting.
Someone told me Sanders speaks Russian in one of his films, not sure if it's true. And we should note that Sanders had been making motion pictures at Fox since 1937, still very early in his screen career.
Getting back to the leads-- here's some trivia: Joan Bennett & Walter Pidgeon also appeared together in BIG BROWN EYES at Paramount in 1936 and in the UA release THE HOUSE ACROSS THE BAY from 1940.