Patzer

There is a reflection of Count Orlock's head in the mirror moments after a big deal was made about the fact that he cast no reflection in the same mirror (although this is possibly a deliberate nod to Nosferatu, eine Symphonie des Grauens (1922) in which a similar error was made).

In the titles on screen (as in a silent film), the first time the Count's name is listed as "Orlock"; midway through the film, when there are titles again, it's spelled "Orlok".

A woman walks in with two Pekingese, which she hands to two men on opposite sides of her. The dogs swap places twice between shots.

As Gustav is going to bed, he picks up one of the candles, brings it to his bed and blows it out. Although there's still a candle in the room, the room turns dark in the next shot from outside the building.

When Wagner first arrives by plane he moves his goggles from his eyes, the camera changes shot and he moves his goggles again.

It was utterly impossible to film at night in 1922, so all night-time scenes were actually filmed in broad daylight. Originally, these scenes were tinted blue in order to differentiate them from those that were supposed to take place by day.

When Skrek first sees the picture of Greta the photos do not match between shots. This is because the first shot of the photo is taken from Nosferatu, eine Symphonie des Grauens (1922).

When Murnau first introduces Shreck to the other actors he says "his method is unusual" and informs them that Shreck would remain in character even off camera. While method acting was not well-known outside of Soviet Union at the time, Murnau could have been using a more general meaning of the word.

When Greta is lying on the bed looking in the mirror at herself and terrified that Max Schreck has no reflection in the mirror, her own movements do not match with her movements that are reflected in the mirror.

At the beginning one of Murnau's assistants calls him one of the greatest movie makers ever, with D.W. Griffith and Sergei Eisenstein. In 1921 Eisenstein had not yet directed any movie (his first movie is from 1923).

When Max Schreck catches a bat in mid air and starts to drink from it (approximately 52:30 into the movie), as he is holding the bat, one of his fingernails comes loose from his finger.

At one point Murnau delivers a diatribe in which he uses the word "Scheisskopf". Contrary to common belief this is NOT a German word.