In the scene where Dracula and Renfield are traveling to London by boat, the footage shown is borrowed from a Universal silent film called The Storm Breaker (1925). Silent films were projected at a different frames-per-second speed from that later adopted for sound films, accounting for the jerky movements and quicker-than-normal action of these shots.
After playing Renfield, Dwight Frye would find himself typecast. He found himself restricted to playing eccentric or jittery characters that had a manic edge to them or criminal lunatic types.
While it is rumored that Bela Lugosi could not speak English very well and had to learn his lines phonetically, this is not true. Lugosi was speaking English as well as he ever would by the time this was filmed.
Generally regarded as the film that kickstarted the horror genre in Hollywood.
Dracula's castle was a painting on glass in front of the camera. The coach traveling along the road was real but the background was not.