Agreed on the audio track - it does an excellent job of reflecting the extremely inhospitable conditions to which the boosters are subjected. I'm also curious about the cameras, although I wish they had been running at fixed sensitivity rather than constantly trying to balance between black space and a very reflective Earth.

I wonder how much the audio was post processed (it says at the end of the video that Skywalker Sound worked on it). I also wonder how much information can be derived about the internal structure of the boosters based on the harmonics of the vibrations picked up by the microphones while outside the atmosphere.