Keep the paperwork and receipts for your appliances. Get to know all the sub contractors. Upgrade fixtures, cabinets and flooring. Eggshell finish for walls. What is the allotment for landscaping and make sure it's graded properly. Walk through the interior when it's dark with a good flashlight, this will highlight flaws that you would otherwise not see during the day(dents in cabinets/vanities, flaws in the painting, etc., flooring issues...