It's one of my favorite TV shows, probably my favorite if I had to pick. Lately I've just been watching scenes on Youtube, but one scene struck out to me as a clever thing the writers did. So the part where Skylar is explaining how they've had money coming is becuase Walters been gambling, is a gambling addict and is shockingly good at it because of his intelligence making him good at counting cards and whatnot. If you piece together earlier scenes and look between the lines it's clear that this story is a lie, that actually he's been making his money by cooking and selling meth.