This film features the first man-into-bat transformation ever seen on camera. In Dracula (1931) no transformations were shown on screen. Both John Carradine and Bela Lugosi would get similar treatment over the next five years.
While filming, Louise Allbritton and co-star Robert Paige were constantly playing jokes on their cast mates. One day, Pat Moriarity and Paige were filming a scene where they flip open her character's coffin. They were astonished upon opening the lid to find Allbritton inside, completely naked.
When Professor Brewster is reading a book on Count Dracula, the first four lines - beginning with "What manner of man is this Dracula?" and ending with "I am encompassed with terrors I dare not think of." - are paraphrased excerpts from Chapter 3 of Bram Stoker's novel 'Dracula'.
In the film, the vampires never display any fangs. Turkey's Atif Kaptan became the first actor to show fangs as a vampire in 1953's
Drakula Istanbul'da (Dracula in Istanbul). But in the 1922 silent film "Nosferatu", actor Max Schreck had long front fangs.
"Son of Dracula" was the first vampire movie from Universal to be based in a contemporary setting. There are no scenes based in Dracula's homeland, nor any scenes based in England.