Well one thing is clear to me :
The safety briefings don't work for many passengers.
The industry needs a re-think on how to get it's message across on what to to do in this sort or emergency.
Certainly enough pax on this flight got it right and I suspect there was a significant number just copying what others did.
As discussed earlier, there is a practical limit to training Pax even in their own language.
If I was ever to find myself in such a situation the message I would want is
The guys behind the locked door have got their masks on
Fat chance of that so I would cross everything and hope the decent starts soon and I hope my assumption that all was working smoothly was confirmed.