* NightmareFuel: The ants can be this, depending on your view. As well as the blood-red title (in the actual film, no less) and [[FridgeHorror implications of the first scene.]]
** The trailer as well. "...with things so horrible...so terrifying...SO HIDEOUS! There is no word to describe ''THEM''."
* OneSceneWonder: Fess Parker as the pilot-witness; landed him his role as Davey Crockett.
* SpecialEffectsFailure: Compared to today's slick CGI, the ants look dated, but the giant models were impressive for their time, albeit slow-moving. One reason most of the following giant-thing movies were so bad is that pretty much all of them used clumsy super-imposed images to serve as the monster.
** NothingIsScarier: Much of the beginning of the film shows only the aftermath of the ants' attacks. We see only the damage they have caused and a few bodies, one of which is filled with acid and chewed to bits. This helped build up their menace prior to them turning up on screen.
* HellIsThatNoise: The noise that the ants make is extremely chilling.