Revealing mistake: When Professor von Franz (Willem Dafoe) sets fire to Knock's coffin, the flame jets can be seen under the casket.
Professor Albin Eberhart von Franz: We are here encountering the vampyre... Nosferatu.
Trivia: Harry Styles and Anya Taylor-Joy were originally cast to star in the film in 2017, but both had to bow out because production was pushed back considerably and scheduling conflicts arose.