I once heard you should never do a vanish as your closing effect, however... so this might not be exactly what you are looking for but it might spark an idea if you've ever seen a good comedian you'll notice many of them use running gags, or jokes, often they will close with a joke that reminds everyone of the first joke, or a running joke, with this in mind, consider an effect where you could somehow vanish the bottle you produced in your opening. Then as you turn around as if you are looking for the bottle, the audience could see the back of your shirt having been screen printed with the same card as was used during your McComical deck, just some ideas, to work with...
I have an effect called " Anywhere Bill " out and with it you could do a running gag type act, one of the effects in Anywhere Bill 2 mentions doing a bill in playing card, to make this a running gag, you begin by having a card selected, that card is then found inside your wallet, in fact it is the only thing inside your wallet next you borrow a one dollar bill tearing a corner from it, or tearing it in half you give them part of the bill ( no switch they get the part of the bill you tore from the bill, and the remainder of that bill is destroyed or vanished I prefer to stay away from the too perfect syndrome so recommend a vanished bill over a burned bill in most cases not all cases, just most one other important thing about the tear, I make it a point to have them watch closely, even assign members to watch each half, "you sir watch this half and you watch this half" that way they know you didnt switch out either of the halves after the bill was torn ) at any rate after getting rid of your portion of the torn bill, you offer to do the impossible as you just did with the card you will make the bill reappear in your wallet you could joke by explaining that this is in fact more impossible than the card in your was to get into wallet, as your wallet has never actually held real money, for the young kids in the audience thats what happens when you get married going on you point out that the wallet has been sitting their in full view since we started, have someone pick up the wallet and look inside all they see is the card from the earlier effect, you act surprised, ask them to look closer, still just the card from here you attempt to explain, sometimes, not all the times but sometimes, the card will not just go to the center of the wallet, but to the center of whatever is in the wallet, now having them remove the card from the wallet and hold it to the light, they will see inside the card is the missing corner/half of their bill. the Bill can then be torn apart to reveal the bill's serail numbers match and the tear lines line up.
Just some ideas hopefully something will be of use or spark an idea for you, if you have any questions email me, I'll help out where I can