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.
Suggested correction: Impossible. When Ben Peterson is killed near the film's end, you can see that the ant's mandibles leave too much space even as they clamp shut. And their slender form is made for grabbing bites, not sturdy enough for crushing jobs.
That's just what I was talking about, if not quite correctly worded.