Continuity: When the Graboid drags the truck across open country there is a rifle in a rack in the cab of the truck. In one shot Earl knocks it off with his arm as he looks behind the truck, and the gun is now hanging horizontal from one of the spokes on the rack. Two shots later the gun is firmly back on the rack. It's quite apparent that neither of them had made an effort to put the gun back on the rack.

Audio problem: In the scene where the Grabboid is pulling the truck with the chain attached and the guy is trying to shoot it, the gun noises do not match up with the muzzle flashes at all. At one point it is obvious he fires 2 shots, and yet 4 "bangs" can be heard.

Revealing: It's very clear they blew up a model of the buildings. The grass seen just before the explosions is way too long and is not as long when the characters are running away. Further, the truck and the barrels have disappeared at the explosion shot.

Continuity: In the scene where the Graboid is pulling the truck you can see that there is a gunrack and a gun in it. Right before they are about to hit the rock you can see that the gun falls off of the gunrack. The gun goes on and off the rack between the following shots.