While I was watching with a friend, I kept saying that Katara should be the narrator, and she kept wondering where all these animals came from and why Korra didn't get one that could fly. (She's seen the first series-just last year, actually-but we didn't watch it together so I don't know if she was wondering about the animals then too.)

I really hope we see some of how the Gaang stayed in contact over the years? Tenzen and Lin Bai Fong's interaction made me think they were forced to play together as kids and he's always been sent to be the mediator or some such.