Put laundry next to the laundry bin not in it.
Take toothpaste and brush out of holder, uses then puts on the side next to the holder, not in it.
Use shower gel/shampoo from the bathroom tidy and but it on the side next to the bathroom tidy, not in it.
Take off DDs nappy/pjs in the hallway and leaves them there.
Open his sock drawer fully so it hangs out, and then not close it when he has finished (same with all drawers and cupboard doors).
Leave the bath water in the bath when he has finished.
Leave spilt water over the bathroom floor.
Not make the bed when gets up after me (most of the time).
AAAAAAARGH.
Feel free to add your own