Check your HRV/air exchange filters to ensure they are clean (if applicable).
Make sure the attic access is easily accessible. For example, if your attic access is in a closet, please clear out the top shelf of the closet.
If it's winter, have walkways shoveled, if it's summer yard is tidy and law mowed.
Have your home "show ready" for the inspector as it makes a good impression. Remember that the buyers and the buyers' agent will be coming back to see the house again. They want to feel assured that they are buying a well presented and clean home that has been cared for.
Have all downspouts in the down position and draining away from the home.
Have keys for the detached garage left out and easily identifiable for the inspector if the keys are not in the lockbox (if applicable).
Pick up any dog "droppings" from the yard (if applicable).
Replace any burnt out light bulbs.
Have your washer and dryer empty. Some inspectors will run the rinse cycle and test the dryer to ensure it is working.
Ensure there is easy access to all rooms, electrical panels, the furnace, water heater etc.