(at around 12 mins) When Jonathan Harker leaves to meet Count Dracula, he rides a brown horse, but when he arrives, he is riding a black horse.
(at around 1h 10 mins) It is commonly accepted in vampire legend that it is unbearable for Dracula to look at a crucifix. When he arrives in Wismar by boat, he brings his coffins ashore and hides them in a church. On the way, he walks over a cemetery full of crosses, which do not seem to hurt him at all. Inside the church, however, he is repelled by a crucifix hanging there because unlike the simple crosses in the cemetery, it bears a likeness of Christ.
(at around 1h 18 mins) When Dracula breaks in on Lucy Harker at night and talks to her, you can see the tips of his fingers being reflected in the mirror, as well as his face in the top right-hand corner, until Lucy moves in front of it. Later on, Lucy reads that vampires do not have a reflection.
(at around 12 mins) When Harker rides his horse to the Count's town, his horse has a white bandage on its left front leg that appears and disappears repeatedly from one shot to the next. Although the journey to the town took 4 weeks to complete, it is highly unlikely that the horse would get injured, heal, and then get injured in the same spot again. Apparently two different horses were used.
(at around 1h 30 mins) As Lucy Harker walks into the town square, she passes a 1970s single strut town bench concreted into the cobbles, and double yellow lines (no parking). When Lucy Harker shuts the front door of her house, there is a Yale lock on it.
(at around 21 mins) When Harker walks along a rocky ledge by a river on his way to the Count's castle, a sturdy guardrail made of cement posts and thick metal wires is clearly visible along the edge of the path.
(at around 1h 40 mins) The rooftops are seen to be covered with TV antennae in the final shot of the town.
(at around 1h 12 mins) When the coach carrying Harker goes through the town gate, there is modern graffiti on both sides of the gate.
In the scenes set in Wismar (Delft), there are blue and white signs on many houses, indicating that they are landmarks or monuments. These signs did not exist in the 19th century
(at around 39 mins) During the time-lapse sequence of Dracula's Castle, you can clearly see around the top-center of the castle what appears to be people walking up and down the walls.
(at around 1h 7 mins) According to the captain's log read by the mayor of Wismar, the ship bearing Nosferatu went through the Black Sea, headed for the ports of Varna and Biscay. Biscay is a province in northern Spain on the completely opposite side of the continent from the Black Sea.
(at around 1h 1 min) In the original story, the captain ties himself to the helm because Dracula crossing water causes horrible storms. Tying one's self to the helm is meant to keep you from being washed overboard in a storm. Without any storms depicted, the captain's action makes little sense. (Tying the wheel alone would have made more sense, if his purpose was only to keep the ship on course in case he fell asleep.)
(at around 1h 1 min) Though everyone on the ship dies during its voyage with Dracula aboard, including its captain, it still manages to miraculously reach its intended destination, the very town in which Lucy and Jonathan live. Even assuming Dracula was a competent navigator, the ship would be left to wander aimlessly through the daylight hours, rendering it completely unfeasible that it could arrive before Jonathan.
(at around 58 mins) When the captain of the ship is writing in his log he says they left the Caspian Sea, which is landlocked and nearly 1000 miles away from the port in Bulgaria where the voyage started. Bulgaria is on the Black Sea.