Continuity mistake: In the beginning of the film where Charlie watches Dandridge 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)
Visible crew/equipment: As Charley watches Billy dump a heavy black bag into the Jeep, the shot changes to a first-person view of Jerry walking on the roof getting ready to take flight as a vampire. As he jumps, a crew member and filming equipment are visible. (00:15:15)
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)
Revealing mistake: As Jerry leaves Mrs. Brewster's bedroom, a mirror reflection shows the door opening a crack before he even touches the knob. (00:27:00)
Audio problem: Right before Charley gets thrown into the closet doors, Jerry has him by the throat threatening to kill his mother if she wakes up. In the shots of Charley trying to free himself of the grip, Jerry's lips are moving but no sound can be heard. (00:28:15)
Revealing mistake: When Jerry is dragging Charley across the bedroom by his neck, he turns around and slams him into a wall. It wouldn't be unreasonable to assume that once his head makes contact, the wall's gonna break somewhere. But notice how the wall is already cracked right above the classic convertible picture a split second before it should be (widescreen only). (00:29:05)
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 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)
Continuity mistake: After Amy punches Evil and shoves him aside, he grabs hold of his right arm. Between shots, he lets go of his arm. (00:41:35)
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)
Revealing mistake: A string is visible pulling the rocking chair on Jerry's porch as Charley approaches the house. (01:14:20)
Continuity mistake: As Peter watches Evil's wolf form drag itself across the floor in pain, the balusters and broken wood fragments on the floor rearrange themselves. (01:20:55)
Continuity mistake: When Evil is below the staircase transforming from wolf into man, he grabs hold of the table leg lodged in his chest. Between shots he goes from using one hand, then two. (01:21:50)
Continuity mistake: Right before Jerry busts through a stained glass window, Peter can be seen holding a wooden table leg - which was driven through Evil's wolf form earlier. In the following shot the leg is nowhere to be seen. (01:32:00)
Continuity mistake: When Peter Vincent is fighting back Jerry in bat form he is scratched on the cheek drawing blood. When the bat flies away and for the rest of the movie there is no scratch on Peter's cheek. (01:34:20)
Revealing mistake: During the basement finale, lines can be seen suspending Jerry in the air when he lunges towards Peter and sends him crashing into some shelves stacked with glass bottles. (01:37:55)
Revealing mistake: When Charley stabs Dandridge in the hand with his pencil, he stabs the hand holding him by the neck. The depth of the wound on Dandridge's hand reveals that the pencil should have stabbed Charlie in his neck and given him a severe wound, if not kill him.
Other mistake: Before the wolf changes back into Evil Ed you can see the black cables pulling the fake wolf across the carpet.
Revealing mistake: Charley stabs Jerry Dandridge in the hand with a pencil. Look closely as he removes it, you can see it comes out in an 'antenna' fashion with a sucker attached in the palm of his hand.
Continuity mistake: In the scene in the burger joint when Amy grabs the kid's BBQ sandwich and smashes it in Charlie's face for ignoring her. First the two tomato slices fall completely off his face, then one slice reappears on his right cheek, and in the final shot no more tomatoes.
Answer: Peter's odd behavior at Jerry's house made Jerry suspicious. When he discovers the shard of the mirror on the ground he finds out why Peter was spooked: Jerry doesn't cast a reflection. Jerry then decided that Charley's friends must be dealt with. In Ed, Jerry sees something which would lead him to believe Ed would make a good servant. Jerry turns Ed into a vampire and sets him against Peter while he himself deals with Charley and Amy.
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