10 Basic Mistakes That Ruin Movies

The Butterfly Effect is an entertaining enough movie if you're able to forgive its flawed time travel logic, but there's one flabbergasting oversight that's ultimately too much for many to look past.

Mid-way through the movie, Evan (Ashton Kutcher) ends up in prison and, in an attempt to prove to his cellmate that he can time travel, travels back to his childhood and impales his hands on his schoolteacher's sharp notepad holder.

This causes scars to suddenly appear on his hands in the present, instantly convincing his cellmate.

Except, that's not how the firmly established rules of cause and effect work in the movie up to this point - if Evan injured his hands as a child, then the scars should've always been visible to the cellmate.

More to the point, given the film's central theme of small changes having a potentially huge impact on a person's life, it's odd that Evan impaling his hands as a child didn't alter his life path at all - he still wound up in prison with the exact same cellmate.

As neat as the film's concept is, the filmmakers clearly didn't put enough thought into the minor details - or at least hoped that audiences en masse wouldn't consider it too deeply.