10 Things You Somehow Missed In Zodiac (2007)

10. Jake Gyllenhaal's Arm Hair Is Fake

Films like Terminator 2, Jurassic Park, and The Abyss proved computer-generated imagery was a groundbreaking tool in the world of visual effects. Even though many of the greatest special effects in the history of cinema were crafted by this technology, naysayers always make the same complaint. "You can always tell it's CGI." Despite the fact VFX gets better every year, some film fanatics believe they can always tell what's real and what isn't.

But there is some subtle CGI in Zodiac that will fool anybody. In the film, Jake Gyllenhaal plays Robert Graysmith - the cartoonist who helped crack the Zodiac ciphers. Even though Gyllenhaal is marvellous in the role, the director, David Fincher, worried the actor looked too young. Because Gyllenhaal's hands "were too hairless and pretty", the filmmaker worried that viewers wouldn't buy him as the man who worked on the biggest serial killer case in American history.

To make Gyllenhaal look more mature, the special effects team digitally added hair to the actor's knuckles anytime there's a close-up of Graysmith's hands, especially while he's holding the Zodiac's letters.