Find Secret Cars:
To find secret cars, search for the paint cans marked with ????. Going through the can will unlock the car.
Pencil-Drawn Mode:
In Paris, go to the Musee du Louvre and drive up to one of the glass pyramids. Press up on the right analog stick to look at it. Hold your stare for 30 seconds and the screen will have a textured look, and everything will look like it