It's great to see everyone checking the rules - but don't let them scare you. As has been noted, the intent is to have a comprehensive checklist for you OR your mechanic to use when going over your car prior to the event. We will do a basic tech at the event to ensure that safety items are in place, and I think I remember reading where HPT requires lights to be taped, so that will be a requirement as well (this is no huge deal - just put an X of electrical tape over your fog lamps or a couple stripes across the front signal lamps).
Oil and coolant leaks - none is best. If you get one or two drips overnight, don't get spun up about it. We're looking for the cars that are going to litter the track with the stuff and make the day a lot less fun for the people behind them. Cars that don't leak tend to have bigger issues that are best tended to before you subject them to track time. My Spyder has a bad oil leak from the TEC3 cam position sensor...if I want to run the track, I'm going to have to replace the valve cover - but I know that it's better for the car in the long run if I get rid of that leak anyway.