Every time I review the rules I find something new. New to me that is, and not necessarily that the rules have changed. It's more that I see something I've forgotten or that perhaps didn't sink all the way in.
I think it couldn't hurt to review the rules at least as often as we change the batteries in our smoke alarms. ( Much better than scouring the rules to find where you messed up. ) Daylight Savings Time starts March 11, by the way.