Visible crew/equipment: Sometimes, especially at night, you can see the lights of the equipment reflect off of Tony's glasses. We know this isn't the moon or a car light because for one thing it's the wrong shape and when Rudolf is sucking blood out of the cow there is no moon or car nearby. So there is only one place the light could have come from, and that would be the crew equipment.
The Little Vampire (2000)
1 visible crew/equipment mistake
Directed by: Uli Edel
Starring: Richard E. Grant, Alice Krige, Jim Carter, Jonathan Lipnicki, Rollo Weeks
Revealing mistake: In the scene where Rudolph is saving Tony from the truck he says, "close your eyes, Tony". But in the next scene when they are on the blimp the boys introduce themselves. Rudolph did not yet know Tony's name but yet he said it.
Tony: Bed for the undead?
Trivia: The vampire's last name was Sackville-Bagg - Bilbo Baggins' relations in The Lord of the Rings were the Sackville-Bagginses.