Revealing mistake: The streets and the sidewalks are always wet, despite the fact that it's sunny the whole time.
Suggested correction: Sometimes there are many minutes, or even an hour, in between scenes that would have passed in universe. More than enough time for a quick rainstorm to roll through off camera.
Revealing mistake: Just as Liz goes to talk to Mike (where she talks about slitting their wrists with Geoff's knife) Geoff is in the foreground of the shot, covered in a coat/blanket/something, and is supposed to be dead. But you can see his stomach and chest moving as the actor breathes. (01:25:05)
Revealing mistake: When Pea and Jody are about to beat up the kids that took Jody's bike and liqueur, if you look to the far left in the alleyway the red camera light is visible. (01:23:45)
Revealing mistake: When Hubert breaks the tooth on the first transexual you can see light reflected on the lacquer covering the real tooth in his mouth. (00:06:40)
Revealing mistake: In the scene where unit 91 is calling in the Spurbury Police car, it is obvious the car's ignition is not turned on.
Revealing mistake: When Rick puts Ray on the table at the brick plant, he stands him up and lies him down. Right before he puts him onto the table, Ray lifts his leg up to assist Rick to get him up there.
Revealing mistake: When Corky (as Agent Pissant) is taking the perp in and starts to sing, the car makes a full 90° left turn (you can tell by the background), yet he never turns the wheel and both hands stay on the top of the wheel.