Anachronisms: At the beginning of the movie one of Murnau's assistants calls him one of the greatest moviemakers ever, with D.W. Griffith and Sergei M. Eisenstein. In 1921 Eisenstein had not yet directed any movie (his first movie is from 1923).
Continuity: 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".
Continuity: When Murnau converses with Greta in the beginning, the length of her cigarette changes inconsistently from shot to shot.
Continuity: You can see 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).
Continuity: In the final scene the pillows on the bed are piled up, yet when the actress goes to lay down on the bed, they need to be piled up again.
Continuity: After they film Gustav entering the castle, he is talking in the doorway with Murnau and Grau. Murnau and Grau then walk into the courtyard where Gustav is already waiting for them.
Continuity: 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.
Revealing mistakes: 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.
Continuity: When the crew are filming the first scene featuring Gustav and Schreck together, just after Murnau says, "No make-up!" Schreck jumps from the the head of the table to the large-backed chair between shots.
Plot holes: While Orlock doesn't cast a reflection in the mirror he can be filmed on the camera.
Anachronisms: 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.
Anachronisms: Murnau introduces Max Schrenk as "the ultimate method actor", and explains that he will appear only in character and make-up; method acting was unknown in 1922.
Continuity: Wagner arrives in his airplane in broad daylight, but it's pitch dark a few seconds later when he walks over to the camera and crew.
Continuity: When Wagner first arrives by plane he moves his goggles from his eyes,the camera changes shot and he moves his goggles again.
Anachronisms: The photo of Greta is a color photo. In 1921, color photography was not widespread.
Incorrectly regarded as goofs: 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).