Recap: Avatar: The Last Airbender "The Northern Air Temple"
- "I laugh at gravity all the time. Heh heh, gravity."
- Berserk Button: Aang did not take kindly to how the refugees changed the temple.
- Bittersweet Ending: The heroes manage to drive the Fire Nation troops away from the Northern Air Temple, but the Fire Nation now has a working prototype of a war balloon. Judging by the Mechanist's worried expression at the end of the episode, he seems to have realized the implications of this.
- Black Comedy: At one point, the Mechanist mentions how it only took him three tries to get his finger-safe knife sharpener right. He then pulls out his left hand's three prosthetic fingers and throws them at Sokka.
- Chekhov's Gun: The war balloon.
- Foreshadowing: Take a good look at the plans the Mechanist is working on... Also take note of the Fire Nation commander's interest in the balloon wreck.
- The Coconut Effect: Invoked, Sokka and the Machinist put rotten eggs in the sealed natural gas room to produce the common sulfur smell, and warn for gas leaks.
- Gadgeteer Genius/Reluctant Mad Scientist: The Mechanist
- Gunship Rescue: How the ending battle is won.
- Inspirationally Disadvantaged: Averted with Teo, who might be an excellent pilot, but this is never suggested to be because he is paraplegic, nor does anyone seem to consider him in any way unusual. The only notice anyone takes of Teo's handicap is when Sokka is impressed by his "glider chair".
- Inspired By: Sokka and The Mechanist's idea of adding the scent of rotten eggs to the gas to identify the source of the leak is similar to the real world process of adding ethanethiol to otherwise odorless LPG to make it detectable for humans. In fact, many of the Mechanist's inventions are inspired by real life. People told time with grooved candles before clocks (albeit not ones with gunpowder spaced along the fuse); hot air balloons have similar vents to those proposed by Sokka.
- Nice Job Breaking It, Hero: The Fire Nation grabs the wreck of the war balloon and manages to make it work.
- Steam Punk: This aspect of the show is really amped up in this episode.
- Stuff Blowing Up: The mountain is full of methane pockets. One of them is right beneath the Fire Nation's forces. Guess what happens?
- Swallowed a Fly: When Katara tries out a glider."How do I land this—Ackk! Bug! BUG! That was a BUG!"
- White And White Morality: Aang versus the refugees. It's a morally complex situation where no one is really right or wrong.
- Yank the Dog's Chain: After hearing about flying people at the temple, Aang is naturally crushed to learn all their flying is done with mechanical assistance.