Given the fanfare with which Avengers: Endgame was released, it feels like we heard directors Joe and Anthony Russo and screenwriters Christopher Markus and Stephen McFeely talk about pretty much every single aspect of the film. But you may be surprised to learn there’s even more insight to be gleaned from the audio commentary track on the Blu-ray release of the movie, in which the Russo Brothers, Markus, and McFeely talk about the making of Avengers: Endgame for three hours. This is the highest-grossing film of all time, but also one of the most complicated productions in …