Other mistake: When Judith is locked in J.D. and Wayne's basement, she is first wearing a long night gown and she is chained at the ankle to an engine. Then she is given a box of clothes to use and she is next seen wearing shorts - how did she put them on if she was chained at the ankle?
Continuity mistake: During Darren's date with Sandy, he had electrodes attached to his nipples to help him forget about Judith. But they soon catch fire and burn holes in his shirt. Later, when you look at his pockets, you can see that his pockets are burned, but the shirt actually touching him is still intact.