Revealing mistake: When the monsters approach The Cyber gang outside the arcade, Cyber Scooby (who wears the red color) is seen in a blue color in one of the shots facing the arcade.
Revealing mistake: In the beginning, Gordon is driving his truck and "drinking" something out of a thermal mug. He's be-bopping around so much it would have spilled all over him. If you look closely, you can see he's not really drinking at all.
Revealing mistake: When Diane and Jack are coming back from the store to get groceries, Diane throws a piece of paper out of the car and you see it fall straight down. If they were actually driving it would have flown backwards.
Revealing mistake: When Josh calls Sam on his cell phone you can see on the phone "No Service", right before he dials the 555 number.
Revealing mistake: When Paul is in the car trying to escape, he hits one of the villagers. The man is obviously yanked back by a harness before the car hits him.
Revealing mistake: When Liv Tyler is washing the car, after she squeezes the sponge onto her chest and leans down, the next shot is shown in reverse - the soap and the water travel upwards. (00:36:00)
Revealing mistake: When Chabot and Vlad are on the ceiling, one of Chabot's fake nails falls off.
Revealing mistake: In the last shot of Elwood machine gunning his Mercedes, he's run out of ammo - there's no belt left.
Revealing mistake: In the air traffic controller scene, the discussion is that "Lear 918" has changed altitude, while the aircraft is actually a Lockheed Jetstar (N680TT). (00:17:15)
Revealing mistake: After Erika stabs herself in the lobby of the conservatory there is no trace of blood on the knife when she pulls it out. (02:02:10)
Revealing mistake: At the beginning of the movie when Gordy is doing the voices of the drawings, he creases one of the pictures and it lifts up. You can see that the picture is a photocopy of the original, although apparently these drawings are original. This happens several other times in the movie.
Revealing mistake: In the opening scene Vinnie Jones is driving the red Mercedes CLK convertible. As the scene switches views of him driving, the view of Vinnie and the car changes in a flipped shot.
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 Beverly is trying two throw herself down the stairs after she finds out she's pregnant, the padding on her behind to go down stairs shows through her pajamas. (00:30:40)
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 Vercingétorix leaves the Romans to go to Gergovia there is a stone mason by the road carving what is probably a distance marker. The man's chisel is obviously not in contact with the stone - while he is banging it with the hammer it is waving around in the air. (00:17:00)
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 Ali is in the rain on the pay phone at the motel it is a modern phone, not from the era they were trying to portray.