Continuity mistake: When Fred is stalking Judy as she enters her house at the start, Judy is holding some books. When it cuts to a close-up shot of her, the way she holds the books changes, then it happens again in the next shot. Additionally, after Fred falls down, Judy's mother looks behind her, but in the next shot, she is looking straight ahead. (00:02:52)
Continuity mistake: When Kevin is talking to Fred at the beginning of the movie, his cap changes angle throughout the whole scene. (00:12:10 - 00:13:45)
Continuity mistake: When Fred disguises himself to get to Judy's house, as he walks by his garage, there is nothing inside the first garage window to the left. In the next shot, a curtain appears inside that garage window, then disappears two shots later. (00:22:18)
Continuity mistake: When Fred goes crazy for Judy the objects in the background change places.
Continuity mistake: When Fred and Bertha are getting ready for the fake party, in one shot you can see that VCR is zoomed right in on them, but when Bertha is dressed and dances like a rap star it is now zoomed back. They could not have zoomed it out because they would have had to take the flashlight and the tape out and then put it in again.
