At 22:20 Elon talks about one of his many mistakes. He uses the model 3 production hell as an example and specifically discusses a production chokepoint. There was a fiberglass mat on top of the batter pack that was slowing production so Elon first tries to better automate the process. Then he tried to accelerate. Then he tried to optimize.
Finally he asks the battery safety team what are these mats for? They say for noise and vibration. But Elon says you're the battery dept so he goes to noise, vibration, and harshness (NVH) team and they tell him it's for fire safety. At this point Elon questions if he's in some sort of simulation and he's trapped in a dilbert cartoon.
Getting a lot more information on what Elon is talking about when he says production is difficult. This video is definitely worth watching.
[Edit] at 31:45 Elon mentions they use model 3 motors to move the grid fins. I thought that was cool.