Revealing mistake: It is obvious that the night scenes were filmed in broad daylight, since clear shadows are still cast on any available surface.
Factual error: The problem with firing a cannon on steam power is to have the boiling water build enough pressure inside the barrel, with no leaks or openings to release it before its time. The professor's scarf and the plug hammered into the fuse hole (which also flies off just before the shot) wouldn't be good enough as pressure restrainers.
Count Von Krolock: I am a night bird. I am not much good in the daytime.
Trivia: It was during the casting tryouts for the movie that Polanski and Tate first met; they got married about two years later.
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