The biggest problem with this show...
I've just finished watching the series (I know I'm late to the party...) and first of all I want to say that I really enjoyed it. Great flick. Obviously the ending was a downer, but it's understandable why that was. I like the survival theme a lot more than the terrorist/spy plot and I wished they would've insisted on that more. I'm sad the show ended but honestly I didn't like the spy/special agent/dethroning government direction they were heading in the second season, so it's easier to cope with.
That said, the biggest problem that I have with the show, in terms of credibility, is that they were still using money after the bombing. I understand it's not a very big problem in the plot development, but it's just stupidly unrealistic. The writers obviously have no clue about monetary economics or economics for that matter.
Short time after the bombing money would be less valuable than toilet paper because of hyperinflation. Yet that's a national problem, in a small town like Jericho with no connection to the outside world money would not even exist any more. I know they were mostly shown changing goods for goods, and that's a good thing, but there were few instances where they did refer to money, like in the beginning the girl buying the last can of soda for $20 if I remember correctly, and of course the whole plot with Goetz stealing $10.000 through accounting and the old-new dollar currency converting they mentioned. That's just dumb writing.
Also, the store lady giving goods for antics was ridiculously stupid considering the situation they were in at that point, but I'll give this a pass an consider the character could've just been dumb enough to think it was a good investment.