20 Things You Didn't Know About Zodiac
13. Fincher Gave Jake Gyllenhaal A Doll & Old-Fashioned Diaper To Prepare For His Role
The role of Robert Graysmith called for Jake Gyllenhaal to be more than just a young cartoonist who becomes obsessed with the Zodiac case - he also had to be convincing in the part of a father.
And so, Fincher baffled his star by reportedly giving him a doll and an old-fashioned diaper as preparatory props for the role.
Given that Fincher has spoken openly about finding Gyllenhaal "scattered" and "distracted" during the shoot, perhaps he was hoping such a bizarre move might help focus his energies in the right direction.
You can't really argue with the end result, even if it's definitely a weird tactic, even for Fincher.