One from the AWA (where I noticed it most, at least): The times that a wrestler reaches for the ropes and the referee kicks their hands off. Then later on in the same match, they don't. Joe Fiorito, longtime Winnipeg house show referee, did this all the time.
It was always presented that you have to be close enough to go through the ropes to get the break easily (basically a whole arm or leg through the ropes), as opposed to reaching out for the ropes and grabbing them from a distance (stretching out the rope towards you), which is why the ref would not call for the break.
So, from a rules standpoint it's technically right, but the visual was always the ref being a dick and playing favourites with the face.