Other mistake: In the opening scene of this German movie from 1944, a panoramic view of the city of Potsdam is shown with the subtitle "Potsdam 1813". In the background, the two high radio masts of the Potsdam Military Communication Central can be seen very clearly before the sky.
Other mistake: Daffy walks past the same table and couch four times. When he runs the other direction, he passes the same staircase five times.