I'm loving these discussions. One thing I noticed towards the end of season 4 was that Walt was doing a lot more drinking than normal. Obviously the most significant instance being when Walt told Hank that Gale wasn't Heisenberg in a drunken splendor. And I'm pretty sure every episode so far (1, 2, and 3) this season feature Walt with some kind of alcoholic drink. I'm probably blowing this out of proportion, but I hypothesize that Walt will develop an addiction to the booze and it will play a part in his downfall. I don't know, we'll see.
Also, did anyone else start brewing up theories when Walt and Jesse were watching the Three Stooges after the cook in episode 3? Maybe the 3 Amigos (as Saul refers to Walt, Jesse, and himself) are actually the 3 Stooges. Maybe Mike is playing them by taking more money than he needs, so he can give it to his grand daughter. Although I don't think Mike would do that to Jesse. But who knows, in the words of Walter White, "There's no better reason than family."