FIFA use competitions such as the World Cup to develop new priorities for Refs which then filter down to our Leagues.
So far, the focus appears to be on shirt holding in the area and time wasting.
I'm particularly pleased about the shirt holding. There's absolutely no need for it and imo it should be ruled out of the game completely. If players understand that they will be penalised for shirt holding, we should have much cleaner competition in the box at corners and free kicks.
As for time wasting; we've recently suffered from enormous injury times - to our cost. I think we need to get used to 10+ minutes and it might be worth putting an extra hour on the parking ticket!
Refs are still struggling with VAR and the 'clear and obvious' error judgement needs to be either applied or disregarded absolutely - but make up your minds which.