This film was made at a point of frustration and fear for the British. They had bumbled into a frightening war against a truly evil foreign government, and had watched helplessly as their ally fell. It is a mark of the strength of British character that this movie was made, complete with a healthy dollop of comedy in it (including self-parody). Basically the film acknowledges the treachery and evil of the Nazis and their collaborators (Paul Henried here), and the failure of the British to successfully account for it in the period of Chamberlain's government (Baldwin's previous government had tried to counter it but faced overwhelming pacifist spirit in the Labor and Tory Parties). Rex Harrison (aided by Basil Radford and Naughton Wayne) represent the Britain that pulls itself together to use the same deceit to snatch back what was lost.
As noted in several comments above, Radford and Wayne are Charters and Caldicott again, still traveling on continental trains, discussing cricket matches, and proving up to fighting the enemy if that enemy shows it's hands. Harrison looks almost dashing (complete with monocle) in his Nazi disguise outfit. He makes the comment about the Siegfried Line at one point...and nobody ever has explained it. The best single line belongs to Raymond Huntley, as a Nazi officer trying to understand whether the comment "This is a fine country we live in" was meant as a put down or not. After being left alone for a moment or two, he repeats it with different emphasis on "fine country". Then looking at the camera with complete honesty he says "This is a bloody awful country we live in." I am sure British audiences in 1940 fully agreed with Huntley.
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