When they drive the jeep, shortly after throwing out the noisemaker-chain, you can briefly see that the image has been mirrored and the truck they're in has the steering-wheel on the right side as they zig-zag through the open fields, but in the closeup-view its a normal car.
Kate incorrectly refers to the Shriekers as "hermaphrodites". How the Shriekers reproduce would be considered a form of asexual reproduction. Indeed, Kate then says "they reproduce without having sex". The term 'hermaphrodite' refers to animals that have both sets of male and female reproductive organs. In the case of the Shriekers, in which they don't appear to have any such reproductive organs, they would be considered asexual.
When Earl's truck is being pulled by the graboid that bit the chain, there is something sitting on top of the case of explosives that is covered by a brown tarp which disappears and reappears between shots.
Just before Earl thinks of being showered with the fire extinguishers, the green roller door is free of obstructions. Though as Earl grabs the first fire extinguisher and proceeds to run back to the door, the roller door is obstructed by several items.
After Earl and Grady discover that their graboid had been "eaten", they go back to wait on the truck for Pedro to show up. When the camera is showing Earl and Grady, the sky is pitch black. However, while Pedro is driving along and then stops, the sky is a dark blue.
When Burt accidentally shoots the engine block of the Jeep, the characters go to examine the damage. At the end of a long dolly shot following the group to the car, the camera stops and can clearly be seen in the reflection of the side of the jeep, to the right of the bullet hole.
The movie is mainly set in Chiapas, Mexico, which is that country's southernmost state and covered in jungle and rain forest. However, the movie shows a desert setting inconsistent with the stated location.
When Burt is doing his personal log on his way back after the radio failure, he notes that it's 19:00 hours on May 14. Whether it's 19:00 GMT or 7:00 P.M. local time, it would not be dark, but in fact still rather light out.
When Earl, Grady, and Kate are trapped on top of the oil towers out of the shrieker's grasp and Earl is talking about the fact that there's no-one near them and no transport, you can clearly see a white van driving past to the left of the screen.
When Earl and Grady notice the graboid running away from them, the seismographic monitor shows the readout from Burt's truck arriving at the refinery in reverse. This is noticeable due to the fact that the monitor is on the floor of the truck, yet there is daylight from a window frame behind it. Also, the object that's supposed to distinguish their truck from the monster is normally a solid square, in this shot it's an outline; just like the monitor in the refinery office.
When the first graboid is blown up, parts of it are raining down on Earl and Grady. This is all coming from the side of the truck directly in front of Earl. Just as the "rain" is dying down a large chunk of graboid flies in from the left, the area to the rear of the truck, appearing to be thrown by someone.
Many of the cars in the movie had been sitting outside all day during they final day in the movie, and the sun shining through the wind shield would make the cars seem like an oven to the shriekers. They never seemed to pay any attention to them and instead they focused on the much cooler humans