Plot hole: Susan theorises that the insects have evolved to resemble people because of predatory pressure. However, for this to be true people must have been killing them - apart from the handful of 'moles and junkies' (who were the prey, not the killers) this film shows the first contact between humans and the evolved 'Judas bug'.
Mimic (1997)
1 plot hole
Directed by: Guillermo del Toro
Starring: Mira Sorvino, Jeremy Northam, Giancarlo Giannini, Alexander Goodwin
Continuity mistake: Peter walks into the bathroom holding a box of Chinese and a bottle of wine. He puts them down and hugs Sarah. She falls backwards into the bath and now he too is holding a glass of cloudy looking water. (00:08:25)
Susan Tyler: When I increased the Judas' metabolism, I must have sped up its breeding cycle. I mean, we're talking tens, hundreds of thousands of generations, who knows how many mutations.
Peter Mann: I don't get it, I just don't fucking get this. How could the Judas evolve into this?
Susan Tyler: Think generations, not years, okay. It took only 40,000 generations for apes to turn into humans.
Peter Mann: So?
Susan Tyler: We changed its DNA, Peter! I mean, we don't know what we did.
Trivia: In the original ending as intended, the "King" of the Judas Breed wouldn't be killed by the train, but would rather in silhouette form back into a human "mimic." He'd step out of the shadows to reveal the perfect image of a nude human male. He would then point at Susan and in English tell her to "leave", implying that the Judas Breed had reached such a stage in their evolution to be able to perfectly mimic human beings, even down to speech patterns. This was in keeping with the original, much more apocalyptic tone of the story before script-changes forced by the producers.