When Fredersen and Rotwang leave Rotwang's laboratory to observe Maria's secret meeting, they descend a spiral staircase that spirals clockwise. When they reach the bottom of the stairs, they are seen descending a spiral staircase that spirals counterclockwise. This is repeated when Freder uses the same staircase later in the film. (This could very well be the result of editing: the footage could have been reversed by mistake. This was the case in some of Lawrence of Arabia (1962)'s footage of the desert panoramas where a whole reel was reversed.)
Crew or equipment visible
On the Kino DVD, this is a dark scene in chapter 15. The brightness setting has to be turned up to catch this mistake. Rotwang is escorting Joh Fredersen to the catacombs. He has just closed a trap door and is passing Fredesen down the stairway. A cord or cable (possibly an extension cord) is visible fluttering besides Rotwang's right foot.
Maria is preparing to leave the catacombs and Rotwang has sneaked in to kidnap her. He diverts her attention by throwing a loose brick to the ground a short distance from himself. The candle Maria is holding is probably a prop that is actually a gas burner. A hose or cord (possibly a gas supply hose) is visible on the ground behind her on her left. She turns to her right and walks. The hose is pulled by her right heel.
Fritz Lang shot more than one version of this movie. There are differences between the version on the Madacy DVD and the Kino DVD. In the Kino DVD, Freder exits the Moloch machine hall in chapter 7 (at around 55 mins). The shot of Freder descending the stairs is missing two motorized utility carts. These appear in the Madacy Video DVD in Chapter 3 (at around 24 mins).
Although the story takes place in some distant future millennium there are hilarious archaisms throughout the production: they still rely on steam power, transportation never evolves beyond 1920's automobiles and biplanes, clocks and meters are still dial-faced, levers still control operations, phones are still clunky handsets with chords, and people still dress in top hats and tails, frock coats, jodhpurs, Byron shirts, and schoolmarm dresses.