Have your AC nobs all pointing straight up as you can, make sure your seat belt buckles int he rear are buckled and straight as you can make them, glove box cleaned, trunk cleaned as mentioned above, clean inside of engine compartment with a fine haired brush around areas you would have never thought would get noticed....and also take those bumper gaurds off your car doors, they knock points off of for that ( consider rental car status ).
we dont do MCA car shows for the reason of pure pickyness, they take all the entire fun out of it, they expect cars not to be driven daily, and I belioeve they should knock points off of cars that have been trailored there...just because I have gathered half the bugs from SC to the event....