When Dracula burns up at the end, the skeleton which remains has no fangs.
Van Helsing tells his assistant to prepare bedrooms for Mina and Lucy on the ground floor. He then instructs them not to venture beyond the first floor due to instability of his patients on the upper floors. But that night when Lucy wanders out of her room, Mina is seen coming down the stairs looking for her.
When Jonathan is awakened by the maid in the hotel, he jumps up with his vest on and chases her through the door. When catches her outside the door he is not wearing his vest.
Jonathan falls asleep the first time with his coat and tie on but wakes up with neither.
At about 58:00 into the movie Renfield falls from at least a 4th story window onto a stone surface and ends up only hurting his elbow.
At the end of the movie, Jonathan and Quincy move a rock back and forth and push it off a wall. It would be impossible for two men to move a 3 foot square rock that weigh around 4,000 pounds.
Mina sends a note saying she is at the opera, but clearly the performance is not an opera, but choral music.
When Dracula and Harker pass in front of a mirror, the Count is holding a candelabra. Of course the Count has no reflection, but the candelabra should have been visible.
When the massive boulder is pushed over the wall, it glances off the horse's head without any effect on the horse whatsoever.
In the Italian version, "Renfield" is misspelled in the end credits as "Reinferd".
The story is set in the 19th Century. However, modern sidewalk painting can be clearly seen in some scenes.
When Jonathan turns down the "Coachman's" flask, he says "No thank you, I don't need it" without moving his lips.
The shadows of various crew members can be seen in several scenes throughout the movie, most noticeably in the first scene set in Renfield's cell.