Spoilers: I found the movie's portrayal of a social conflict quite disappointing.

The movie goes as far as showing that oppressed workers will lash out in a violent protest, but then it deflects this anger towards the mad scientist, and the conflict kind of fizzles out? And I think it ends with the owner of the factory promising not to oppress them as much, and the owner's privileged son promising to upkeep this, basically reinforcing the existing social order.

Doing anything else would stray dangerously towards socialism, though, so as a product of its time it's understandable.