Roaches, rodents, flies, or other pests present — or doors and openings that let them in not protected.
Scoops and other in-use utensils stored improperly (e.g. handle down in the food).
Single-use items (cups, straws, to-go containers) stored or handled improperly.
Plumbing not installed or maintained properly — leaks, mop sink issues, unserviced water filters, or missing backflow prevention.