Most of them are rule changes that were adopted last year at the Congress and enacted last year. It was too late to get them in the rule books last year, so they're showing up as rule changes for this year.
The way I've handled it in the past.
I call the coach over and tell him "Skip, you verified at the plate meeting that all of your players were properly equipped. Now I see one of your players with a band-aid covering an earring. Am I going to have to send both of you hme early?"
The coach will immediately call the player in and make him remove the earring. It's never failed me.