Not quite sure how to express this but there are some parents at school who seem to feel entitled to constantly bend the rules in small ways. The deal in ks1 is that you wait with your child til a teacher comes, this parent doesn't. The same and several others talk to the teacher at the end of the day more than anyone else. A few send their child in with things that aren't allowed leading to manageable but annoying "we'll that's up to x's mummy isn't it" . And because dd is good friends with one of these children, she comes to play at our house and there's always a bend to the pick up arrangements because she hasn't thought things through. Or they frequently bring a sibling to a class party when it seems as if they've got a way round it.
All I wish is that people would think sometimes "would this be okay if everyone did it?" And then sometimes decide not to do whatever it is. Sometimes of course, it's because you have to and that's different.