I haven't been through a delivery appointment yet so I have no firsthand experience on that side, but I've noticed there are people who prefer to use a checklist when looking over the car to make sure they remember to check some of the things that are easy to miss, and there are others who think that's inappropriate. I'm slightly pro-checklist, as a car is a complicated product and this one still has a reputation for lingering build quality issues in spite of improvements. Since there was a swell of new orders after the price cut, production and QC may be more rushed recently than they were in the previous few months. I will tailor my checklist to things I'm likely to forget or miss, and I'll keep it on my phone so that I'm not the guy looking like the county inspector writing up a fast food restaurant. I'll also take a lot of detailed close-up photos in case I notice something later.
Above all, I think the most important thing is to enjoy it, be friendly to the staff, and make it clear you're just excited to check out the car, you're not a cynical person looking to make their lives more difficult over petty things. While it shouldn't be this way, their perception of you will make a difference in their willingness to try to find a solution if there is a problem. If you find problems that are small, make it clear that you understand they're no big deal, you're not upset about them, you just need them acknowledged and a plan for correcting them. While it's possible that you can still get a canned response like "that glaringly crooked panel gap is within spec", I think it's more likely to go that way if the tone is adversarial. These employees have to write off unreasonable, chronically unhappy customers all day every day, so it will be to your benefit to make sure you don't get lumped in with that crowd.
This is all probably obvious to everyone reading this thread, but I am amazed how many grown adults I see getting huffy over simple things, then wondering why nobody ever wants to provide them good service or help them out.
Enjoy your new car and report back on your experience!