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.
Visible crew/equipment: In the closeup shots of the soda cans shooting out, you can very clearly see the the two hoses which are making the sodas shoot out.
Factual error: The rocket launcher that is used on the big yellow plough is a single shot M1A1 L.A.W. (Light Anti-tank Weapon). However, the woman then picks it up and fires it again. It could not have had another rocket in it, and reloading it takes much longer than the few seconds between firings in the film. Plus Joey didn't connect the firing clip to the trigger mechanism, as would be needed.
Visible crew/equipment: When the trucks have been circling the diner for about 20 minutes, in a leading shot of the big green goblin head on what appears to be the main truck, you can see a light coloured car in said truck's shiny metal bumper, but there are just trucks in the circle of possessed vehicles. The truck in front of the green goblin head truck isn't that colour either.
Continuity mistake: At the baseball field, a steamroller comes crashing through the billboard and rolls over a boy on the ground. You can see the roller's steering wheel falling off when he crashes through the board. The next shot, it is there again.
Visible crew/equipment: When Deke is riding his bike down the street on the ground you can see the camera cars tire tracks. This is only visible in the wet parts of the street.
Continuity mistake: At the baseball park when the steamroller runs over the kid, first the the kid has his arms on top of his head, then in the next shot his arms are down.
Visible crew/equipment: When the gunner is about to explode, you can see the incendiary device under the gunner.
Revealing mistake: During the scene where Curt and Connie stop at the gas station, When Curt jumps to avoid the tow truck, you can see the dead gas station attendant (or possibly a crew member) laying down. When the truck skids to a stop you can briefly see him get up and move around behind the bushes to the left.
Factual error: When the fuel truck arrives at the Dixie Boy to refuel the receptacle the spigot is moving by itself to release the fuel, however this is impossible because the spigot doesn't have electrical components, just like the spigot for the water sprinklers when Deke is riding through the neighborhood.
Revealing mistake: At the end of the movie when the survivors are sailing on the boat, the guy piloting it is Steve's stunt double because he has straight hair and is a completely different actor. In the next shot it's Steve piloting the boat.
Continuity mistake: When the trucks start circling the Dixie Boy, they show the Green Goblin truck starting the circle, and you see the old blue and white truck behind the orange Bic truck, then the next scene shows the toilet paper truck etc. and the blue and white truck is shown again.
Continuity mistake: When the bulldozer and army car show up at the Dixie Boy, the army car is missing the cap on the horn, but then when it is giving Morse code the cap appears.