One important thing to remember is that they don't want to advertise the name 'Disney's California Adventure'. They've figured out that it's big, bulky, awkward, and not exactly something that rolls off the tongue. That's why you've noticed a change in the last couple of years in the DCA logo w/ the larger Disney's above a smaller California Adventure. They'll say it when they need to, but in a 30-second spot, you want the familiar Disneyland logo there.
-- PMM
