Them!

Factual error: The crew gasses out the ant hill by dropping chemical grenades into the hole. But there are two reality mistakes about the grenades: 1) chemical grenades do not explode; they spray their contents into the area; and 2) considering the size of the ants, the size of their nest must be gigantic, and therefore, it would take more than a hundred grenades to flood it completely with cyanide gas.

Factual error: Grandpa Johnson's .30-30 Winchester rifle was apparently bent by the giant ants during their attack on his store. But as we can see later, the ants' mandibles are too thin and too curved to provide enough gripping and leverage area for bending a metal rifle barrel that severely.

Daniel4646

Factual error: In order to keep the giant ants inside the New Mexico nest, the protagonists bombard the entrance hole with phosphorus shells. Phosphorus burns at an average temperature of 5,000° Farenheit. At this temperature, the heat from the shells should have fused the sand around the entrance hole to glass (the threshold for this process is about 4,200° Farenheit), yet the sand remains unchanged.

Daniel4646

Factual error: When they put the pin on the map of Texas to mark the city of Brownsville, they are hundreds of miles off in West Texas near the city of Alpine. Happens around the time the patient who crashed the plane is interviewed in the hospital in Brownsville.

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Mistakes

When James Whitmore is attacked by the ant in the Los Angeles sewer system, James Arness arrives, firing an M-1 Garand rifle. In the next scene, he's armed with a Thompson submachine gun.

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Trivia

When Ben Peterson is killed by a giant ant, he emits a high-pitched, half-choked death scream. This scream has been used in many other movies ever since: in Small Soldiers (when Brick Bazooka loses his legs); in Star Wars - A New Hope, when Luke shoots a stormtrooper in the shaft-swinging scene; in Lord Of The Rings - The Two Towers, when an Elf warrior is thrown off the Helm's Deep wall; and in Lord Of The Rings - Return of The King, when a Gondor soldier fleeing from Osgilliath is snatched up and dumped by a Nazgul steed. I guess that makes it the most used death scream in movie history.

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