Continuity mistake: When the video of Kimmy plays on the school announcements, and she talks about Duncan being hung up on Veronica, there is a cut to Duncan reacting with raised eyebrows in the foreground, while Veronica can be seen in the background with a passive expression. Then it cuts to a close-up of Veronica having a visible reaction with her whole face falling. But since Veronica and Duncan were reacting to the same thing, Veronica's reaction should have been visible in the first shot as well.
Continuity mistake: In Episode "Happily Never After": In the opening when the CSI team is looking at the puncture wound of Fiona Chisolm, there is no blood coming from the wound. It is actually mentioned that there is no blood. Then it is determined that she was dead for about 6 hours, but now there is an L-shaped blood drip pattern to the chest wound.
Continuity mistake: When Brian and Gerry are chasing Kelly, Kelly's jacket is only zipped up at the bottom at the start of the chase, but when the camera angle changes it is zipped all the way up for the rest of the chase.
Continuity mistake: When Shirley walks through the door you can see over Alan's shoulder that he's reading the comics in the daily paper. As they talk the paper changes to the business section.
Continuity mistake: During the scene when Mickey walks into the urinals trying to steal the videotape, he has the phone in his hand calling the switchboard. He then puts it into his hand and turns the taps on. He washes his hands and leaves the urinals without the phone in his hand. Then, in the next shot, he walks through the door with the phone in his hand and puts it into his pocket. (00:11:00)
The Body in the Library - S1-E1
Continuity mistake: Joanna Lumley has long hair tied back while driving her car but much shorter hair subsequently.