If you paid attentions to the dialogue somewhere midway in the movie, Ellen specifically mentioned that her father sought her out as a changeling, a shape shifting force from the forests. Although correlation does not imply causation here, I feel that Orlok is way too obsessed with Ellen for them to be simply two strangers. It actually makes sense they were estranged family once.
Again another controversial opinion – Anna (Emma Corrin) actually looks more pretty due to makeup than Ellen (Daughter of the OG Jack Sparrow) in the movie, so Nosferatu had to have a reason to consume her more thoroughly for an entire night and not get fooled that he was getting tricked by her throughout. Definitely a very student of the Devil, if in the end Orlok could not realize he was getting played all the way in the end.
Spl mention – Willem Dafoe acting is par anything we have seen so far. What's up with his mention of Priestess of Isis related to the occult?