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I think there are many sub text points in this film that one can draw parallels to the Nazis.

Of course you can do that, it's a fair way of viewing the movie, but there's a difference between interpretation and intent. Of course Q II can be interpreted as an anti-Nazi movie--but I doubt that it was intended that way. Why would anyone bother to create a science fiction adventure of this nature in order to criticize the Nazis and their concentration camps when they could just as easily make a movie DIRECTLY about the Nazis and their concentration camps? Sure, some WWII iconography was employed, but as Ted points out, it's lifted from actual British "Loose lips sink ships" wartime directives, not from Nazi Germany.
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Even some of the signs in the backround of some scenes. "Talk about your job and lose it" Graphics not unlike Nazi propaganda.

It is also exactly like signs posted in British and American factories during World War II. (You can see examples in Hitchcock's SABOTEUR.) I think Kneale was criticizing his countrymen who blindly went along with such directives without ever questioning the need for them. The "sheep" in the film aren't those actually taken over by the aliens, but the townspeople who never stopped to wonder why artificial food uses the chemicals the aliens are employing, or anything about the "overshots" that crash to ground here and there.