Revealing mistake: Just after the girl gets killed by the flying robot between the two yellow digger machines, the rest of the group start firing at the robot. If you watch the robot, the same animation of the robot is repeated over and over again every time the camera cuts back to it.
Revealing mistake: When the Sheriff is in pursuit of the black SUV, there is a particular shot of the Sheriff's car doing a wide right turn and you can see that it's a young bald stunt driver, completely unlike the older, full head of hair Bruce Boxleitner.
