Corrected entry: After killing a Graboid, Grady says, "That makes $300,000," meaning they only killed six, but they actually killed, including the most recent one, eleven.
Corrected entry: When Grady leaves the radio playing on the ground, a graboid eats it. The next day, when foolish Grady steps on the ground, he hears the radio playing in the graboid's mouth. Don't you think that from running non-stop for that period of time, the batteries would've died?
Correction: A radio doesn't use that much power. Not as much as a tape player or portable CD player. A battery operated radio should easily run 24hours non-stop, quite probably more.
Corrected entry: In the scene where the graboid is pulling the truck, Grady tries to shoot the graboid to make it release the chain. Wouldn't it have been easier to shoot the chain?
Correction: A thick chain is not easily shot with a rifle. The chain is round and is usually not hit straight on, so the bullet will most likely deflect off the chain and most of the impact will be absorbed by the chain being pushed away by the bullet.
Corrected entry: While the graboid is pulling the truck across country, look at the ground between the graboid and the truck and you will see tire tracks on the ground.
Correction: Why is this a mistake? Earl and Grady have been driving all over the valley all day and the oil company trucks have been there before then. There are tire tracks all over the place.
Corrected entry: In the scene where the monster is pulling the truck, the truck has a rifle on its gun rack. The rifle gets into the hands of Brady who is in the truck bed, then back into the gun rack a few scenes later while Brady is still in the bed.
Correction: It would make sense that they would each have a rifle, and that it's not one jumping around due to bad editing.
Corrected entry: According to Kate, every time the walking graboids eat, they reproduce. If this is so, how come they didn't reproduce when they ate Pedro or Julio?
Correction: Who's to say they don't? We never see the shrieker that ate Pedro and Earl and Grady kill the other one less than a minute after it ate Julio.
Corrected entry: Kate finds a Graboid fossil and explains that the rock is from the Precambrian era (which ran from about 4.5 billion years ago through about 500 million years ago), thus making them literally the oldest complex life-forms in the history of Earth. Cool idea, but it makes no sense. Life in the Precambrian era was mostly bacterial or simplistic organisms such as sea-sponges and jellyfish late in the era. Something like the Graboids just couldn't have existed, both because they're too complex to have existed in that time-frame and also (and more importantly) because there wouldn't be an adequate food source for them to thrive. Sure, maybe they could have existed during the time of dinosaurs, but that only started about 250 million years ago, way after the end of the Precambrian era.
Correction: They retconned this in the TV series, saying that Kate had misdated the fossil, which was actually from the Devonian Period.
I don't think a retcon validates a movie mistake.
Correction: The oldest known life forms. Graboids existed, therefore other life forms existed too, which they ate, we've just not discovered them yet.
Correction: The graboids might not have originated from earth. Like suggested they could be aliens and their species landed on Earth 5 billion years ago.
The movie states that they are from Earth. The suggestion that they're aliens is invalidated in the film itself, as it is proven wrong by the scene in question. Ergo, this correction is invalid. Also, this correction fails to address one of the key issues brought up in the mistake - they wouldn't have a viable food source and would have died out, even if the preposterous notion that they were aliens were true.
Correction: This is speculation at best regarding creatures that don't exist in real life. There's no way to say they wouldn't have adequate food source without knowing what they needed to survive, or how they evolved.
Correction: $300,000 each for Earl and Grady. 12 dead Graboids even though they only show 11 explosions.
Grumpy Scot