Re: Window shutters
It is so that if we were to evacuate, the crew can't really see a great deal from the little round window in their doors, so may have to quickly glance into the cabin to check the area outside their doors. Also for emergency services can look in the windows if no one has initiated an evacuation as we are all knocked out.
There are valid reasons for why we ask pax do do things , not just because we like saying it. Also for baggage under the seat, is doesn't block the exit into the aisle in case of an emergency
Seat backs forward for take off and landing - so it does not block the pax behind you evactation route.
Music off on landing and take off, so you can hear any evecuation commands if something goes wrong. All common sense really. Just wish pax would stop asking - WHY????!