It's very common to have a little rust at the bottom of the doors where the weatherstripping goes. Also, I recommend trying out the seat heaters too. You should feel heat from both the back and lower part of the seats. If yours has either of these small issues, point it out to the salesman and maybe you'll get a few bucks off the price. Other than that, there's not much that goes wrong.

By the way, if you feel a power surge and/or decrease in power on your drive home, don't panic. It's likely just the intercooler pump dieing and it's a cheap and easy fix.

Welcome to forum and enjoy that roadster.