Corrected entry: The location of the Krolock family crypt is at odds: In order to reach it, the castle courtyard must be crossed (which is level with the available ground), and the crypt stairs lead downwards. In order to reach the crypt via a chute, the professor and Alfred sneak their way across the castle's roofs and battlements to the chute opening in the top of a structure high above ground; and the chute descends only one or two feet before depositing Alfred (but not the professor, who gets stuck) in the crypt.
Corrected entry: The blade of the two-handed sword Alfred uses to ward off the vampires (as he, the professor and Sarah prepare to escape) wobbles.
Correction: Unless someone who is an expert in swords can say otherwise, I don't see this as an error. The sword blade is so long (I'm guessing it's supposed to be a Scottish Claymore) that the wobbles looked natural to me. I doubt such a sword would be useful in combat, but for all we know it was never used by Krolock as anything but a castle decoration and was never used in combat.
Correction: The crypt position is fine. The castle is up on a hill (as any good movie castle would be), with the "chute side" on the edge of a very steep cliff. Going into the courtyard from the entrance it's all level and you reach the crypt, but the other side has battlements since it's by a cliff. When Alfred drops the professor's case you see it tumbling down this cliff.