Early depiction of a female leader
I was surprised by the scenes that show dozens of men listening to Maria's speeches. The commander of the revolution who leads hundreds of guys is not a middle-aged or older man. She's a girl.
Fritz Lang movies seem to have several firsts:
1. Woman in the Moon - First time a rocket launch had a countdown, before it was done in real life.
2. Fury - First known use of film footage as evidence in a trial, before it was done in real life.
3. Fury - First movie to use freeze frames, in the above-mentioned courtroom scene.
4. M - First serial killer movie?
5. Metropolis - First movie to show a young woman in a leadership position?