SFO is a tremendously busy airport 24-7. Hundreds of planes arriving and departing with the control tower trying to herd all the cats well enough that they don't collide with each other. There are multiple runways constantly in use, taxiways that cross the busy runways and all kind of complexity. (Everything is actually very tightly choreographed.) It's probably a lot less confusing once you get used to it. Most of the cockpit audio is the tower talking to other planes but you have to pay attention to it to maintain situational awareness about who is where doing what. I believe that this particular airliner is the one referred to in the audio as "Shamrock".
I'm very familiar with the neighborhoods that the departing plane flies over. My father was a long-time aviation guy who after leaving the Air Force worked as an engineer for United's huge maintainance facility there. As a child I used to live near the airport and since departing planes roared over my head constantly I was a plane spotter for as long as I can remember.
https://www.youtube-nocookie.com/embed/LWVZK52AA0I
I'm very familiar with the neighborhoods that the departing plane flies over. My father was a long-time aviation guy who after leaving the Air Force worked as an engineer for United's huge maintainance facility there. As a child I used to live near the airport and since departing planes roared over my head constantly I was a plane spotter for as long as I can remember.