This week's Dutch LOTG test is also an illustration of one of the challenges - the answer to Q4 is correct in Law, but in practice it's not applied to the letter and for a Sunday Morning parks game, it's irrelevant anyway.
I agree we all have a duty to know the Laws as well as we can, but with the best will in the world we can't expect everyone to remember every word and do that in a few seconds in the heat of the moment. On a recent training event, we did a practice quiz that had been recently given to SG2 referees on a training day. Granted it dug into some of the nooks and crannies of the Laws, but I know very few of that illustrious SG2 group got them all correct !