During the signing make sure that the FINAL price is what you agreed to, dealers always try to add extra administration fees etc. Do not sign anything that has a bigger figure then what you negotiated.
Also, inspect the car really well upon delivery. Make sure you can do it in daylight, as that's when you can see most scratches and defects. If you notice some defects, again don't sign anything until it's fixed. Dealer may try to say that they will fix it later or something like that, don't fall for it, the car must be perfect when you take it home. With scratches or stains, if you take it home they will blame you and won’t fix it.
Oh, one more thing, when you’re on campus park as far away as you can, students don’t really pay attention when they open the doors and some will actually ding your car on purpose just out of jealousy.
And above all, ENJOY THE CAR!!!