Why is vampire lore so inconsistent in vampire films, TV series, books, etc? For example, sometimes vampires have to be invited in before they can enter your home, but in other shows you don't hear that. Sometimes cats are scared of them; other times not. Sometimes they have a problem dealing with wooden crosses, garlic and holy water; other times these are just minor discomforts. Some can turn into bats. Sources agree that they can be killed by a driving wooden stakes through their hearts, but sometimes decapitation works too (why not burning at the stake?). Just now I was watching Ingrid Pitt combing her hair in the mirror in the Vampire Lovers. I think she likes the shade, but she doesn't burn up in daylight.