20 Things You Didn't Know About Zodiac

5. Orlando Bloom Was Fincher's Second Choice For Robert Graysmith

Though Jake Gyllenhaal was Fincher's first choice to play Graysmith, he did nevertheless have a backup in mind in case the actor wasn't available or unwilling - and you'd probably never guess who.

Indeed, Fincher eyed Orlando Bloom as his second choice for the part, in what if nothing else would've ensured a very different portrayal of Graysmith.

That's not a knock against Bloom at all, even if it's tough to picture him playing such a subdued part. Yet Fincher clearly knows what he's doing - hell, the guy got a great performance out of Tyler Perry in Gone Girl - so there's no point doubting the reasoning.