(This concerns realism as in following the laws of physics, not in any other sense.)
When watching movies I generally get frustrated with animation/CGI-people being totally ignorant about the laws of nature, in particular Newton's second and third law.
A prime example of this horror is from "The Day After Tomorrow", in the scene where the transport ship arrives in front of the library. This 1000-ton ship is moving at 2-3 mph, but stops when hitting a bus(!!!). Similar crazy stuff is abundant in most, if not all, films. Please be the exception, Iron Sky!
This being said, my opinion is not that everything should be hyper-realistic, suspension of disbelief is a legitimate trope, but as in the previous example this violation of physical laws does not contribute anything to the film, and it makes your eyes bleed.
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I have to agree with Asmund, getting the physics of that sort of thing is important. The movie will attempt to generate humor from the characters taking every impossible thing as perfectly natural. But, for the audience to go along with it, it would help to have those things which are real act in a real manner. Even the impossible things such as Nazi anti-gravity can work by pre-established limits, rather than being purely arbitrary.
This is akin to how Dr. Strange Love's team took the time to make the bomber cockpit as realistic as possible, to the extent that the Air Force thought they somehow got secret information on the layout. The truth was, they just based it on some extrapolation based on the previous primary bomber.
It's a movie, and a comedy, it could have mutant chickens as shock troops, and the audience wouldn't really care that much :-D