Other mistake: The DVD release was created with a "pseudo widescreen" as various scenes cut off major action. The most obvious is in the beginning of the film when the main character meets the crazy girl. Her head is framed bottom right but the widescreen completely cuts off the crazy girl's head. This can be explained by the enormous aspect ratio of the original film, which is bigger than standard (USA) widescreen, that or a bad transfer.
Continuity mistake: Within the first 15 mins of the film the leader of the bad guys runs back to his car which has its front wheels buried in sand. A moment later the car pulls away with its wheels magically unburied.
Continuity mistake: When Lisa uses a vibrator, you can see in the background of Matt's bedroom a chair with some books on it. However, just about a little over a minute into the scene, when the camera switches between Matt and Lisa, right before she climaxes, the books are gone from the chair. (00:42:45 - 00:43:50)
Factual error: The garage scientists are setting up an experiment. One of the guys goes to tighten the terminals of a battery. He grabs one in each hand and proceeds to tighten them. If he had done that to a real battery he would have gotten the shock of his life. (00:12:00)