Audio problem: A soda can that is supposed to be full hits the man. When the can hits the ground you can hear that it's empty.
Audio problem: In the end when Brad is taking the dead woman's ring, the Happy Toyz truck is sitting there silently. If you look closely, you can see a gentle stream of exhaust from the pipes, meaning that the truck is idling. Yet a moment later you hear it starting up.
Answer: It should be noted, the ending title cards seems to set it up so there are no plot holes and answers any "why" questions (which, intentional or not by King, can be debated). While the opening premise is the comet's close pass by Earth caused all machines to turn on people, at the end, the Russians blew up a UFO 2 days later, suggesting that it was the aliens controlling the machines. Bill suggests aliens are trying to wipe out humanity (although at that point he's just guessing and had no evidence of an alien or UFO present), but it can be debated the actual premise was that aliens were just testing or experimenting on people.
Bishop73