People who have taken driving tests recently here in California tell me that the instructors never "trick" you, that they never ask you to do anything illegal or ill-advised, and that there is no use in being chatty or trying to explain or excuse anything you do. Just routine driving procedures, plus they may ask you about how to operate parts of the car (lights, turning indicators, parking brake, emergency blinkers).
Checking your mirrors to show that you are paying attention to traffic around you is a good idea. I'm not sure that they can really watch your eyeballs move, so it seems sensible to move your head slightly as you look in side-view or rear-view mirrors. Don't exceed posted speed limits nor go waaay too slow.
And I've heard that when turning left you should pull into the intersection only when you are the first car turning left. Don't sit on or just beyond the crosswalk if you are behind another car, since it may turn at the last minute, leaving you turning left after the light turns red.
Crashing into a police car or the wall of the Motor Vehicle building is not recommended, and neither is listening to your iPod and talking on your cell phone while taking the test!