Most blatant goof ever
When Abronsius and Alfred go to the Crypt it is in the cellar. When apprehended by Koukal they go for the back entrance, i. e. the window. Then, much to my initial surprise, they scale the castle walls and enter a TOP FLOOR WINDOW... and lo and behold: The crypt is there, yet it was in the basement just few moments ago!
This makes me think that everyone involved must've been a bit daft not noticing this at any stage of the production. Neither the screenwriter, the set designer nor the actors seem to have noticed this. This is without a doubt one of the most blatantly obvious goofs in a film I've ever seen.