He's starting with a real appealing character, so makes it easier. But this simple facial rig test is appealing and fun to watch, and analyzing it, I think it's because he's doing the Richard Williams thing: key pose Breakdown key pose. Often the breakdown has a blink, but not every time, and it can be as subtle as just a slightly different angle so the head arcs instead of traveling in a straight line. I thought he was overlapping so the mouth gets to it's pose a little after the head (which would be nice to not have everything hitting at once) but realized he's just easing in to his last pose. Also interesting is the head squashing which makes it feel more fleshy, but isn't big enough (usually) to be noticeable.
Then watching his awesome dialogue. It's interesting, the body doesn't do that much movement, basically 1 pose per beat. Transitions between poses are simple straight across with ease into the 2nd one. Then there's some slight adjustments if the limbs are moving big enough to insist on it.
Head and Hands are offset from the torso, usually arriving afterwards. Hands don't actually move that much, maybe once per phrase (instead of per beat like torso) and head is just a little more, Head is kind of bobbling a little during it's poses to sell the feeling of words coming out of her. If the head moves, it feels like it's getting tugged to it's new pose by the eyes. Brows seem to move about as much as the head. Eyes move a ton, never still for long.
Eyes | | | | | | | | |
brows Head | | | | | | |
Hands | | | | | |
torso | | |