Re product placement:
Remember, Netflix shows are different to broadcast shows: normal TV uses its programming to sell adverts, but for Netflix the show is the advert (for the platform). A tie up with Coke or Burger King etc gets the Netflix name out into the world, beyond its ringfenced group of subscribers. I'd be surprised if any of these products paid Netflix anything - it's a mutually beneficial arrangement.
As for the show, I've just got Eps 7 and 8 to go. It's great! The only thing I miss, a little, is the lack of small-town life we've seen - it's all been pretty frenetic. But I guess they played that a lot in S1 and S2. And with it being the summer break, there's no school.