By crashing into a parked vehicle at high speeds, you can alter the camera's perspective. This likely has no use in runs but is still interesting behavior.

By holding S and continuously reversing, you can bypass the 68-mph speed limit usually imposed by the game. Extreme practice would likely be required for this to be useful in a real run, as driving backwards is quite difficult.

Great job on the runs! I couldn't figure out how to get past the speed camera on urban quickly without the game ending the run.