Goofs

Some shots are repeated, like the train passing the same cave three times.

(36 min 35 sec-42 sec) During the "earthquake", the house collapses but the furniture stays still.

When the animated scorpion model approaches the telephone repair truck, the sun is coming from the left. When the scorpion is seen from the reverse angle, the sun is still on the left. The mountain range in the background also remains the same no matter what angle the shot is from.

Drs. Scott and Ramos switch positions three times while driving in the Jeep.

At almost the end of the movie the train passes the same entrance of a cave three times within one minute.

When the dead policeman is found (Sgt. Vega), Hank removes his weapon and inspects it to see if it was fired. The police dispatcher asks Hank if Sgt. Vega had fired all the rounds from his revolver. As Hank answers the dispatcher, he is clearly holding an automatic pistol in his hand that he removed from Vega's holster.

In the final scene, when the soldier is shooting an electrified dart at the scorpion, the scientist mentions that it's connected to a generator supplying 600,000 volts. Very high voltage can travel through air; in other words, there is potential to create a 60 inch long spark. Anyone or anything standing on the ground within 5 feet of the dart or the live wire would have instantly created and attracted this spark. It would have been impossible for the soldier to even touch the live wire to pull the dart back to the truck.

The whole discussion of whether a poison is chemical or organic is nonsensical. While this is forgivable in the general public, the three men discussing it are two geologists and a chemist. Scientists would be aware that all substances in the universe are made of chemicals, and that the use of the word organic in a laboratory setting would not refer to "anything from nature," but to anything from living beings, specifically involving the [chemical] element carbon.

Most likely due to budgetary issues, the voices of the opening sequence's narrator, the police radio dispatcher, the radio newscaster, and the public address announcer are all the same. Specifically, it belongs to Bob Johnson, best remembered for being heard in the opening sequence of most episodes of Mission: Impossible (1966) ("Good morning, Mr. Phelps...").

When the scorpions attack the passenger train, the words "Lionel Lines", trademark name for the famous toy train company, are clearly visible on the engine's coal tender. The tender is also backwards during several cuts, with the coal bunker facing the passenger cars.

When the giant scorpions appear as totally black silhouettes, it is because the money ran out when only the black backing for those composites (to prevent "bleed-through") had been accomplished.

When Sgt. Vega's body is found, Hank takes his gun away and mentions that every round had been fired. The gun is a 1911-series pistol; had all rounds been fired, the slide would have locked back. The gun is later referred to as a revolver by the radio dispatcher.

The shot of the stinger entering the victim's throat when the big scorpion kills the smaller scorpion in the cave is later reused twice when the big one kills two smaller ones at the train wreck.

A few minutes after Teresa, in her first appearance in the movie, has been thrown from her horse, Hank and Artur drive up on the ridge to find her. Though having been knocked unconscious by the fall, as soon as the men are at her side, she awakens and within seconds is all smiles and making pleasant conversation.

There is no windshield on the Jeep.

The final battle takes place in a stadium in Mexico, but the field is laid out in the grid lines used by American football, not soccer which would be more likely.

The shadow of the boom mic is visible against the back wall in the scene at Dr. De La Cruz' laboratory.

Richard Denning (Hank Scott) alternates between calling Juanito (masculine) 'Juanita' (feminine) in multiple scenes.

(49 min 51 sec) When the scientists land in the cave, Hank says, "we've reached the bottom", but we can see that he can see that their cable car has landed on a broad ledge, with a deeper pit spread before them.