In a few episodes the teens drive to Canada and back in an afternoon. If you look on any map you can see that Wisconsin does not touch Canada and it is at least a five hour drive each way from the closest point in Wisconsin to Canada.

Also, the lottery is mentioned in numerous episodes. Wisconsin did not have a lottery until the early '90s and then it was only scratch offs for years.

Finally, there is an episode where Kitty and Red each pawn something of value to buy groceries. Pawn shops are illegal in Wisconsin.