Hey, congratulations PlasticMan1. When we bought our latest motorhome (almost new), I modified one of the checklists to include specific things that were unique to our model of coach. I emailed it to the salesman a week before we took delivery, so they knew exactly what we'd be looking at. Other than doing something like that, I think you'll just have to follow along closely with the person who's doing your walk-through and hope they do a thorough job. I took along a small video recorder to record some of the things that were different than our previous motorhomes (slide operation, location of fuses and circuit breaker panels etc.).
If a dealer has been selling a particular product for awhile, the person doing the walk-through will, hopefully, be very familiar with your coach and how everything works - but... who knows. If you don't live near the dealer, the best advice I could give is to camp somewhere near the dealer after taking delivery, and then operate eveything in the coach. Pull out every drawer, turn on every light and so on. You may find something that isn't working, or that that doesn't fit correctly. A dealer you just purchased from will usually be much more inclined to get you in quickly to fix something than a dealer in a different town.
Once again, congratulations!
Kev