Yeah. In the first season (only season I've seen so far) the German guards occasionally carry around Thomson SMGs instead of the MP-40. Granted, some of them do have MP-40s, but since when did Germans use Tommyies?
And here, as I sit here, watching Hogan's Heros, I see Schultz carrying a Tommy. Doesn't he usually have a K98? But boy, you would have thought someone would have caught that obvious flaw in the show.