Check behind the door, look up check for dust and cobwebs, look down for dust balls, poor vacuuming or edging. Examine hardwood floors for areas that may have been missed. Check molding and tops of picture frames with your finger. Check windowsills, blinds, and windows. Check for fingerprints around doorways, light switches, thermostats, etc. Lift a few things in each room to make sure the duster got underneath items. Are pillows fluffed, blankets neatly folded, magazines straightened.