Other mistake: Before the wolf changes back into Evil Ed you can see the black cables pulling the fake wolf across the carpet.
Fright Night (1985)
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Directed by: Tom HoIland
Starring: Roddy McDowall, Chris Sarandon, William Ragsdale, Amanda Bearse
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More mistakes in Fright Night
Evil Ed: Kill me, Charlie! Before I turn into a vampire and give you a hickey!
Trivia: The drink that Jerry has in his hand while sitting in the living room is a Bloody Mary.
Question: What exactly is Billy Cole supposed to be? We know he is not a vampire because it roams around in the daytime, and we see his reflection in Peter Vincent's mirror, but after he is shot in the head, he turns into some kind of creature. So what is he?
Chosen answer: I would assume a "thrall" basically a ghoul that is attached to the vampire. A ghoul in old lore was created when a vampire gave blood to a living person, but did not take their blood first. They were then their daytime slaves, doing errands, finding victims for them, and took care of the vampire's body when the sun was out.
Billy was to Jerry... what Renfield was to Dracula. Slave, daytime watcher.