I too watched it last night! I was amazed of all the brands that InBev/Anheiser Busch own. That beer wall schematic breakdown of everything AB versus non-AB was downright scary. Makes me proud to get all the beer [that I don't make] from an independent boozahol store where the floorspace for the BMC breweries is tiny compared to their other stock.
As far as the three-tier system, I think they implied it was a state by state thing, but every state uses it. However, I'm pretty sure there are some states that let craft breweries bypass the middle tier. I don't know if that's just done by said craft brewery forming their own distribution company or by some other means.
I also took a piece of advice by the Dogfish Head guy to heart. In the scene where he is giving the beer tasting dinner at the Waldorf Astoria, he mentions something like you should try a BMC beer at room temperature versus a craft brew at room temp and see which one tastes better. I have long since enjoyed my beer warm, thought I don't go out of my way to drink it that way, like when I'm bottling. I'll generally drink whatever I used to take a gravity reading and will actually pour myself another pint of warm-flat homebrew to enjoy while I'm filling. I have yet to have one that wasn't drinkable.