Yeah, I didn't watch the show, but I've always thought I need to be more up on couponing- although, I like to buy fresh wholefoods and I'm not so sure I want to buy in bulk (which is where most of the super savings comes).
A ex-co-worker of my SO does this with his wife at Target. They find "double coupons" and then end up getting hundreds of dollars of "store credit" and have gotten a new tv among other things because of it.
Example:
You find a manufactor coupon for mascara that is buy one, get one free. Then Target has an ad where this same mascara is on sale for say, 50 cents off. You then go to Target and literally buy every tube of mascara that they have... When you go to the register, the cash register computer doesn't understand the double coupon- you have buy one, get one free- but you also have 50 cents off- so the computer doesn't understand that "every other" mascara is free- thus you get 50 cents off EVERY tube and if you buy say, 100 tubes, you're getting a credit of $50! So the store actually owes YOU money.
Do that with a coupe things and you can rack up a couple hundred dollar credit! (But then, oh wait, you have to sell all those stupid mascara tubes on ebay to get rid of them... Unless you have 100 girlfriends that need a tube!)