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.
The Fearless Vampire Killers (1967)
Plot summary
Directed by: Roman Polanski
Starring: Roman Polanski, Alfie Bass, Jack MacGowran, Jessie Robins
Professor Ambrosius and his student Alfred are out in Transilvania seeking to find and destroy vampires, but their intents spiral out of their control when they track Sarah, the kidnapped daughter of their landlord, into the lion's den.
Daniel
More mistakes in The Fearless Vampire Killers
Count Von Krolock: I am a night bird. I am not much good in the daytime.
Trivia: The movie went by quite a number of different titles: 'Dance Of The Vampires' (original UK title); 'The Fearless Vampire Killers, Or: Pardon Me, But Your Teeth Are In My Neck' (US title); 'Vampire Ball' or 'The Vampire Killers' (working titles).