Shouldn't Grinch say 'Reveal and Gain...'? Otherwise everyone else will have to guess whether to be unhappy or not.
The idea was that the cards would be riddled with things people could nitpick about, for the people who really enjoy nitpicking. Fun for everyone!
Yes, but it's only natural for nitpickers to try and work out what were the INTENTIONAL vagaries, and which ones are those that were genuinely overlooked.