Son of Frankenstein

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• Due to the lack of a prepared script, much of the picture was written just moments before the actors were to shoot their scenes. This was how director Rowland V. Lee was able to keep Bela Lugosi working throughout filming, and built up the role of Ygor, which never appeared in the original Willis Cooper screenplay. The actor was forever grateful to Lee for allowing him to create what turned out to be one of his very best characterizations. After many delays, shooting finally started November 9, 1938, finishing January 5, 1939, just days before its prescribed release date of January 13. Boris Karloff's daughter was born on his 51st birthday, November 23, 1938.
• Movie Goof (continuity error): On the train ride to his father's estate, the same tree passes by Baron Wolf Frankenstein's train window several times.
• Movie Goof (continuity error): When Wolf Frankenstein is throwing darts, the position of the darts changes between shots.
• Boris Karloff became a father for the first time while filming this movie.