I flew on Alaska Airlines many times. They have 3 cabin crews on B734, B738 and MD90.
The problem is that there are not enough crew during the flight safety demonstration. 1 crew is in the jumpseat in L1 and is holding mic - about announcement and flight safety demonstration while two other crew are in the aisle performing manual demo (of course AS don't have TVs).
However, there's a wall/curtain between business and Y section but the curtain was opened. So one crew have to perform their manual demo in both classes. Cabin crew has to show it in the business and then ran to the Y and re-do again and then back to the business to show another one then redo in Y again..and them come back again. lol
Qantas has wall/curtains in B737-800 except B737-400. I am wondering whether they will do the same things as Alaska Airlines does!