This post is for commentary with SPOILERS for episodes beyond Book 1, Disc 5.
Chapter 17: The Northern Air Temple
"Even though Teo's not an airbender, he really does have the spirit of one." This episode brings to mind the problem of the lack of airbenders in the world, and how tempting it is to imagine ways that airbending might be revived. I've heard that the creators have sort of nixed this idea by joking how that would require them to change the name of the series or something. But that's just silly. Of course, it makes sense that Aang never found any airbenders that survived the Fire Nation's genocidal campaign, but it doesn't stand to reason that there will be no more airbenders in the future. After all, in Star Wars, Yoda told Luke that after his death "the last of the Jedi will you be." It would have been preposterous to assume Yoda meant there would be no more Jedi again, EVAR! So I’m in favor of proposing ways for the airbenders to return. One way I've seen suggested in some comment thread somewhere is that Aang might use spirit-bending to grant the ability to bend air to someone, or maybe to a few someones. I like that one, although I don't think it's something Aang would take lightly, if he chose to do that (assuming he's even able to do that).
Chapter 18: The Waterbending Master
At Uncle Iroh's music night, I spy two of the crew members dancing. *gasp* Those rebels.
I have to say, I think in this episode it's quite clear that Iroh is rooting for Zuko to capture Aang.
Chapter 20: The Siege of the North, Part 2
We have an interesting conversation between Zhao and Iroh in this episode. We learn that Iroh has been to the spirit world. We also learn that Zhao has been to a secret underground library in the Earth Kingdom.
The Avatar tried to kill Koh 800-900 years ago? Avatar Kuruk couldn't have lived that long ago, could he? Roku died 112 years before. Let's say he was 100 when he died, that would take us back 212 years. Avatar Kyoshi lived an unusually long life, 200-300 years, I think. That would take us back about 512 years. Let's say Kuruk died at 200, so his marriage might have been 180 years before that. That gets us back 692 years. Still not very close to 800. Sounds like someone besides JKR is bad at maths.
I wanted Koh's promise that he would meet Aang again to be realized in the series, because he makes an interesting villain. I discovered today that he did make an appearance in an online animated graphic novel called "Escape from the Spirit World" at the Nickelodeon website.
I remember the first time I saw this, Yue's death made me think this series would be like HP—that the creators would not shy away from being brutal about character deaths. But I was, maybe not exactly disappointed, but a bit surprised that in the end, it wasn't really as brutal as HP. There were only two painful character deaths, Yue and Jet (unless there's someone I'm forgetting?), and no major deaths in the series finale, even among villains.