Sorry, third post on this. It's worth watching the Ready Player One trailer at 0.25x speed to try and spot cool things like 80's cultural references, or hints to the movie. The motorbike (Tron light cycle?) has Atari and Sega logos on it. Several shots of the BTTF Delorean with Parzival on the license plate, and the Bigfoot monster truck.
The coolest one I've found so far is a QR code on the hood of one of the IOI cars here:
It leads to the site
http://opn.to/a/V6ty5 which redirects to an IOI page to recruit egg hunters. Very cool!