More info re: backseat:There’s a separate button in the air conditioning screen controls (bottom right) to activate the rear AC vents even if no one is sitting in the back!
I was always under the impression that the rear vents activated only if someone was sitting in the back. I was so happy when I discovered that button/feature
If you have a baby/child car seat installed in the back seat, the Tesla May warn you that a “passenger” in the back seat has not buckled their seat belt. You can tell the Tesla that you have a car seat installed there to bypass the unbuckled belt warning by tapping the icon on your display for the unbuckled seat, and the icon will change to a car seat!