At about T+1:51, the lower left tile switches to some camera view I don't understand. But only for the fraction of a second, then view is back to normal.
Video at that position:
Snapshot of that particular moment:
My guess? Its the top of the second stage engine. Unusual place for a camera, maybe they have monitoring cameras everywhere so that if something untoward happens they can resurrect the footage and glean some answers? But it looks a lot to me like engine bay electronics - whether its first or second stage is the real question.
It’s interesting how mundane that looks. The wiring is loosely held; not something I’d have expected for a high-G rocket. And you can see a couple of low-pressure actuators that would be at home in anybody’s car.
I wonder if it’s an internal view of some space in The Roadster. Maybe to check that nothing is shaking loose?