Pretty sure incompetence. I don't think they would have put the cast and crew of LaLaLand
through such an experience.
lol. I guess it's all subjective.
I went with "Pretty sure staged"...because actors and crap. Hell, they'd all VOLUNTEER for more face time on stage even in a gag.
We'll probably not know for sure...even if it is staged, they won't admit it. But crap, how incompetent do you have to be to get that one wrong, the "big finale" that they put at the end? I don't think this is the first time either. Seems like that had a "mess up" with someone reading the wrong thing a few years back. "Oh gee...whoopsie".