 Already a huge hit on Broadway, the Deane/Balderston "Dracula" play would become the blueprint as the production gained momentum.The screenwriters carefully studied the silent, unauthorized version, F. W. Murnau's "Nosferatu", for inspiration.Lifted directly from a nearly identical scene in "Nosferatu" that does not appear in Stoker's novel, was the early scene at the Count's castle when Renfield accidentally pricks his finger on a paper clip and it starts to bleed.