Continuity mistake: When Freder exits the Moloch machine hall, in the shot of Freder descending the stairs the two motorized utility carts are missing. (00:15:55)
Continuity mistake: The interior sets of the Rotwang house are much larger than the exterior views (this discrepancy was first noted in a review by H. G. Wells).
Continuity mistake: When Fredersen visits Rotwang to ask about the secret plans found on the dead workers, they descend a spiral staircase that turns clockwise (as seen from the inventor's study). In the next shot the staircase is shown from below and is now anti-clockwise. (00:42:40)
