Continuity mistake: In the beginning of the film where Charlie watches Dandride and Cole move the coffin into their house, there is a close-up shot of Amy removing her blouse. The film then cuts to a close-up again of Charlie and in the background Amy's blouse is still on (probably only visible in the widescreen version of the film). (00:05:20)
Continuity mistake: When Charley is about to be thrown from the bedroom window by Jerry, he accidentally grabs Amy's picture from his desk and throws it to a fence post below. But watch closely and you'll see: this picture is the very same one that fell to the floor in a struggle just a second before Jerry lifted up the window. (00:29:55)
Visible crew/equipment: When the wolf begins to transform back to evil, as the wolf tries to take the wooden stake out of his heart, he leans forward and you can actually see the human arm behind him. He can't have an animals arm and a human arm at the same time - the arm is of an operator working the animatronic.
Continuity mistake: When Charlie and Amy run into the nightclub to get away from Jerry she is wearing a blue purple plaid jacket to match her skirt and blouse. The jacket disappears when Jerry takes her to the dance floor, and she is not carrying it or wearing it when Jerry makes his escape from the nightclub, kidnapping Amy. Then in the scene when Amy wakes up in Jerry's house dressed in the white gown, she begins to focus and look at the portraits on the wall. Directly below and to the right of the first portrait are her clothes, folded neatly over the back of a chair - purple skirt, blue blouse and the matching plaid jacket, which has magically reappeared.
Continuity mistake: When Jerry has Charley pinned to the cracked bedroom wall by his neck, he suddenly drags him over to the window a few feet away - which is nailed securely to the frame - and lifts it up effortlessly. Next, we see Charley looking over to his right side, but now he's back up against the cracked wall in this shot, not a window. (00:29:50)
Continuity mistake: When Charlie and Peter find the bitten wounded Amy lying unconscious on the floor in Jerry's bedroom, she is shaking as she transforms into a vampire. Her hair also changes back and forth between the shots. From a perfect curly coif to a longer frizzy vampish do. Then when Peter enters the room alone, and she gets up, it's suddenly long and curly down her shoulders.
Continuity mistake: After Lieutenant Lennox drives away, Charley rushes over to Evil's house and begs for some vampire-related advice. He agrees to help (at a cost). As Evil is asking where the vampire will likely strike first, he runs both hands through his hair then drops them to his side. But in the following shot, Evil's hands are instantly back on top of his head again (widescreen only). (00:21:35)
Other mistake: When Jerry is in the nightclub starring at Amy you can see his reflection in one of the mirror columns of the dance floor. He is a vampire and shouldn't have a reflection. (01:02:51)