That presentation was dire - awful. Cringeworthy even without the disasterous demo.
It will feature for years to come in classrooms the world over as an example of how not to do a presentation. I actually think it's bad practice to show someone how not to do something, however in this case, I will make an exception.
Elon is not a natural presenter and that is a shame. Nevertheless because of his other talents, people will tolerate a below standard performance and sympathise with him for a bit - not forever. It becomes tiresome. He needs to do some training - we would all benefit from it.
His live audience, some of whom I am sure travelled long distances to be there and were excited by the event will put a brave face on it but they have been let down by their idol. There were even folk in the UK that stayed up to watch it live. What an anticlimax. Imagine how good it could have been with just a little effort.
Sometimes people, no matter how senior, need to be taken aside and told that their lack of preparation and poor presentational skills cost the company.
All the careful nuturing of a company's reputation can be wiped out at a stroke by an ill prepared and unrehearsed presentation.
Sadly in this case, it pretty much sums up the Tesla attitude of 'it'll be alright on the night'.