The Last of Us has been getting a lot of buzz lately, with the Left Behind DLC and whispers of a sequel whetting our appetites for a second helping of what may be the grimmest buddy film/game. Luckily, you can sink your teeth into this nearly two-hour documentary on the making of it. There’s a lot of footage of guys from Naughty Dog sitting on the couch, but that’s OK because they’re generally talking about interesting stuff, like what does and doesn’t work in a novel, and an action movie, and a videogame. They also talk about how they feel…