We were just there this past weekend. No one is checking anything. You just use your room card to enter the pool. There were many groups of people there, kids and adults, and no one has any idea who is actually a hotel guest.
Unlike WDW, yes you can add additional adults (up to the room max of 5) without any additional charge. I've done this a couple of times when an adult niece stayed a couple of nights with us.
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