Absolutely the breaking of the glass during the demo was amateur hour, and has been so during much of Tesla's 10+ years of existence, with Elon getting a solid C- grade for "public presentation performance".
Tesla is a success
despite all that, and this embarrassment won't change that either. Tesla engineering has at times been "driven by embarrassment": the Model 3 panel gaps now exceed German premium car panel gap metrics.
I'm wondering when Elon is finally going to discover that other introvert tech execs are using ... professional coaches to prepare for presentations, with excellent results. Giving good presentations is a technology in essence, one which Elon should eventually acquire.