For a few minutes we could see bubbles of liquid (water?) floating around in zero gravity in some kind of container, the whole scene being lit with pink lighting. Any idea what this is?
That's a camera from inside the fuel tank. The droplets started floating once you had engine cut-off, i.e.: it wasn't accelerating and therefore had no 'gravity' pushing the fuel to the bottom any more.
The world's most expensive lava lamp.
It was cool.
Liquid oxygen! Beautiful blue color, even more so when floating around in microgravity. I love that they light up the interior purely for our benefit. It's Elon's art piece.