It happens to everyone, dealers make mistakes they pay your loser/push or push your loser. Thats great, if I can get paid for losing once in a while.
But what do you do when the floor person comes over a couple hands latter asking for the money back? They got a call from upstairs, and there asking you for the loser plus cash for paying the loser. Some times you know that phone call they just got, after you got paid when you shouldn't have was about the hand that just happend but they don't ask for it back but watch you or the dealer closer.
I've seen players asked for $25 back and then they got up and left the table not to return that day or shift. I've never seen anyone asked to leave or 86'd for not returning the money either. The most I've seen asked back was $200 for a $100 paid loser.

