Other mistake: Hendershott fires the L.A.W., then gets killed. Nobody reloads it, but Wanda fires it at the beer truck as she dies.
Other mistake: When the Happy Toyz truck is first being fueled, the nozzle handle is locked into the fuel position. When you hear the click of the nozzle stopping, the handle doesn't disengage as it should. When the attendant checks it, he unlocks the handle, and doesn't squeeze it again. Even accounting for the comet's effects, the handle must be squeezed to splash fuel in the man's face.
Other mistake: In the pop machine scene, player number 7 gets hit in the head. Yet he stands there like nothing happened before he finally falls down and dies.
Other mistake: On the ball field, the one kid running away gets hit in the lower back by the soda can. Problem is the soda can looked as if it were tossed in a gentle arc rather than directly at him. Also, it barely touched him, and he took a few more steps, then grabbed the spot it hit him, then fell, rather than falling immediately.
Other mistake: It was interesting that the beer truck didn't continue to run. The rocket blew up the side of the trailer, and the tractor was not affected, so it could have continued to run, like Zeke's garbage hauler after it dumped on the bible salesman's car.
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