If this is the one I'm thinking about, a lot of things don't make sense. Firstly, you never see the guy hand the card in and get the cash. Secondly, he won $1700-ish didn't he? Supposedly shops can only pay out up to $500, anything over that you need to go to a centre to collect. Yet this guy supposedly cashed in the card for the full amount at the shop.
Finally, such cards are easy to produce (i.e. produce a fake one and pay the guy out of your own pocket for the sake of the trick). You could easily give a guy a fake card, he genuinely believe he won, then let him in on the trick, give him the cash and film him happy with it. He's not really going to complain.
I'm reading a good book suggested by catmeow which is really opening my eyes on a lot of tricks I couldn't figure out.
Finally, such cards are easy to produce (i.e. produce a fake one and pay the guy out of your own pocket for the sake of the trick). You could easily give a guy a fake card, he genuinely believe he won, then let him in on the trick, give him the cash and film him happy with it. He's not really going to complain.
I'm reading a good book suggested by catmeow which is really opening my eyes on a lot of tricks I couldn't figure out.