20 Things You Didn't Know About Zodiac
2. Jake Gyllenhaal's Knuckles Had CGI Hair Added
We've already noted how extensively David Fincher employed subtle CGI to incredible effect, though there's one minor VFX flourish which boggles the mind above all others.
For one of the close-ups of Jake Gyllenhaal's hands where he's drawing a sketch, Fincher used visual effects to fix his "hairless" knuckles:
"We had to retouch the knuckles of this scene because Jake's hands are very hairless and pretty. The double that we had doing a lot of the writing and drawing had much hairier hands, so we went back and retouched the knuckles so Jake wouldn't feel like we'd done him a disservice!"
Of all the things Fincher has fussed over during his career, this just might be the pettiest.