Toward the end of season 3, Jesse says he's not a killer. He then kills a seemingly innocent man and follows this up with bizarre and rather emotionless behavior. Connect the simple dots, my tall friend.
I started watching this series about a week and a half ago, and I absolutely love it. I'm finally caught up. It seems to me, and probably most folks, that one of the logical leaps is Hank finding out that Walter is really Heisenberg. Or, at least, involved in the operation. Getting to that point is pretty tense. I'm also intrigued by what Gus intends to do with Jesse and Walt. I'm probably wrong, but I thought that maybe Gus was trying to see if Jesse was really that valuable to Walt. That's why he's making him do jobs with Mike. Maybe running a cost/benefit analysis....in a Gus sort of way.
I'm also a dork and like seeing Albuquerque showcased. I recognize the landmarks in most of the scenes. I live maybe 5 minutes from the car wash, and drive past it nearly every day. Walt taught where I went to high school. Hank's shootout with Tuco's cousins took place in the parking lot where I used to work. This is probably nothing novel for people in LA and New York, but it's still kind of wild seeing my city as the setting of the show I love.