It's interesting how animated and expressive both pg and Jessica are. I remember noticing in multiple pg interviews how much facial expressions are used, and Jessica is the same way. They move their eye-brows, modulate their voices, their smile, lean into the camera, use manual gestures, etc.

It definitely comes off as friendly and engaging, but could probably be intimidating in something like the YC interview setting.

I also wonder if one didn't rub off on the other (we unconsciously pick up the mannerisms of our peers), or if it's one reason they get along so well.