- Not long before filming began, Colin Clive broke a leg in a horse riding accident. Consequently, most of Dr. Frankenstein's scenes were shot with him sitting.
- When filming the scene where the monster emerges from the burnt windmill, Boris Karloff slipped and fell into the water-filled well. Upon being helped out, he realized he had broken a leg in the fall. The metal struts used to stiffen his legs (for the famous "monster lurch") helped keep the bones in place until they could be properly set.
- The musical soundtrack for this film proved so popular, it was used again in the Flash Gordon and Buck Rogers serials starring Buster Crabbe.
- Editing after previews resulted in the loss of a subplot in which Karl imitates the Monster's murderous modus operandi to eliminate his miserly aunt and uncle and direct the blame away from himself.
- When the castle is self-destructing, the Doctor can be seen against the far wall. Yet he is next seen outside in the arms of his beloved, watching the explosions. There were two endings originally: the first had Doctor Frankenstein dying within the castle and this was filmed. But the producers judged this a bit harsh and wanted a happy ending, so they shot the extra footage (too expensive to re-film the explosions).
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