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As exacting as Fincher tends to be about the visual effects in his movies - much of which is so brilliantly subtle as to be invisible - there's one scene in the film that doesn't quite measure up.

During several scenes set outside in the cold - especially following the Bill Gates lecture and during the fraternity's Caribbean Night - the cold breath coming out of everyone's mouths was actually added digitally in post-production.

This wasn't a necessity because these scenes were actually filmed in the height of summer or anything, but because Fincher felt that the real-life cold didn't show up well enough on-camera. He said:

"The breath in this is faked. Not that it wasn't ridiculously cold anyway, but we did not have the humidity that it required to have people's breath be visible, and I just felt to ask people to stand out in this kind of cold weather and not see the breath was unfair."

That...sounds like Fincher alright. Once you see it, though, you won't be able to un-see it.