I would guess everything that happens once Orlock arrives in Wisborg. It felt somewhat rushed and I can see that being flushed out more in an extended version.
I would recommend watching it in a theater. Maybe later so it's less packed. The guy chomping popcorn right next to me was annoying so I might go watch it again myself when it's less crowded.
To the other discussion about vampires in general, here's a bit of vampire symbolism to help understand what they mean. There is definitely a sexual aspect, but vampires are essentially the corrupt aspect of the aristocracy. In a healthy hierarchy, those at the top will provide protection, direction, and identity to those below them. In return, those below will provide support and resources to sustain the projects of those above.
When those above only take and give nothing in return so that it only becomes about selfishly sustaining themselves, they become vampiric. They are also obsessed with micromanaging and controlling everything in their domain. At the core, it's the sin of pride more than lust. Vampires are also an inversion of Christ. He gives everything, including his blood, so that we all can have eternal life. The vampire takes everything, including our blood, to give himself eternal life.
