The balloon Mike uses to spark the power lines is rare. Most of these "metallic" looking balloons are actually made from mylar, a plastic, but there are some types that have an aluminum coating, which will cause a short in the electricity. Vince Gilligan actually had an electrician come in to help with this scene.
The Heisenberg hat was largely absent this season. Bryan Cranston was quoted as saying he took note of this and brought the hat back specifically for the scene with Gus to show the power Walt holds.
Walt: I'm gonna need some, some kind of assurance [that I won't die].
Mike: I assure you I could kill you from way over here if it makes you feel any better.
Walt: You've always struck me as a very pragmatic man [Gus], so if I may I would like to review options with you, of which, it seems to me, you have two. Option A: you kill me right here and now. Apparently I have made that very easy for you. You can kill me, no witnesses, and then spend the next few weeks or months tracking down Jesse Pinkman, and you kill him too. A pointless exercise it seems to me, but that is option A.
Gus: What is option B?
Walt: I continue cooking. You and I both forget about Pinkman. We forget this ever happened. We consider this a...lone hiccup in an otherwise long and fruitful business arrangement. I prefer option B.
Original International Air Dates:
Czech Republic: April 1, 2013 on Nova Cinema
"Shambala" by Beastie Boys
"Crapa Pelada" by Quartetto Cetro
"Man Chang Fei"
Cast: R.J. Mitte (Walt Jr.) appears but doesn't have any lines. Betsy Brandt and Dean Norris (Marie and Hank) do not appear.