Nosferatu recently released its extended cut for digital purchase, which is only four minutes longer than the theatrical version. In it, only two scenes are extended, including one that reintroduces some deleted dialogue early on between Count Orlok and Thomas Hutter and features a very interesting reference.
According to Screen Rant, the moment comes when Thomas first arrives at Orlok's manor, after a bewildering journey through Transylvania. On his travels, he encountered a reclusive community observing strange rituals, including exhuming a corpse and stabbing it. In the longer scene in the extended version, Thomas asks Orlok about this.
