For the curious, the flash at 1:52 says:
Some of you might be curious what attending bandcamp is like. Well let me tell you.

You're 12. You're playing in the cornet section. You've had a crush on Holly Willis for weeks now. But you notice her sneaking off with Chris Jones - the first violinist - one day and later at rehearsal they're holding hands.

So you start intentionally playing the wrong notes but everyone just thinks you're mentally ill and the conductor verbally destroys you in front of the entire orchestra.

I hope you're doing great, Chris Jones. I bet you work in IT now and you're rish, Chris Jones.

Fuck you, Chris Jones.