The whole German scene is pretty authentic for us non-German audiences. Yeah sure most characters have a light American accent, but the German language spoken here is still really good by American standards. Most of the time, they don't even bother finding actors who speak German, and we end up with some really atrocious accents.
So they got the color scheme of the police badges right (white on red), but not the motive (they use an eagle instead of a horse, which would be correct for Lower Saxony police, Hannover being the capital of that state). How on earth did that happen? Did they only get low-resolution pictures of police officers?
Not at all? There are plenty of German people and most likely actors in the US who would be willing to do the job.
It would even be easier than looking for Americans who speak German.