Seconding the "all clouds are the same" idea, also every single leaf and blade of grass is identical, and some groups of trees have the wrong group of leaves.
All drinks of the same type taste exactly the same. All colas taste exactly like coke, all orange drinks, carbonated or otherwise, taste like generic orange juice, all beer no matter what tastes like Budweiser. There is no variation whatsoever in different types of drink. Maybe extend this to food as well; all pizza tastes the same, all cheesburgers taste the same, etc. Hell, extend it to everything with taste; all cigarettes are the same,
When butchered, prey animals (chickens, cows, etc) have completely ready-to-cook pieces of meat inside them. IE, cut open a chicken and there will be tenderloins, legs, wings, etc, already cleaned and cut, ready to be cooked.
Pencils never need to be sharpened, pens and markers never run out of ink.
Gas stations don't actually pump gas; when you set up the pump to activate nothing happens but the car still gets refilled and you still get charged.
Waiters, cashiers, drive through operators, etc always follow the company approved script and do not deviate no matter what.
Glass breaks as if it were wood, splintering instead of shattering.
Dogs use litter boxes
Bizarre meat like Buffalo or Ostrich are sold in grocery stores like beef and chicken. Also, all eggs are snake eggs instead of chicken eggs.
Changing rooms in clothing stores are actually bathrooms, complete with sinks and toilets.
Food is never under or overcooked, if you put food in the oven and take it out it is immediately cooked to perfection.