Avatar: The Last Airbender

Season 1

The Boy in the Iceberg

1. Based on all the group shots, the Southern Water Tribe's village (apparently the only one) has a population of twenty two people: nine adults (all women), eleven children (six boys and five girls), and two teenagers (Sokka and Katara, of course). However, one of the six boys is missing when Katara introduces "the entire village" to Aang. There is also a single pet animal (possibly a cross between a dog and a polar bear) present in some shots.
2. First collaboration between director Dave Filoni and voice actor Dee Bradley Baker, who would later join Filoni's Star Wars: The Clone Wars series voicing multiple characters.
3. Although there are many astronomical oddities throughout the series, suggesting significant differences between our Earth and the Avatar world (or indicating the filmmakers' poor knowledge in astronomy), the first two episodes provide a generally accurate depiction of the sun's position at the southern polar region in December (we know it's December, because the winter solstice occurs shortly afterward): the sun is up around the clock (Sokka even mentions the midnight sun) and stands relatively low over the horizon. That being said, the sun is too low for the exact pole - only about 4-5 degrees. At the pole it should be around 20 degrees above the horizon in December. This can be explained if the village is about a thousand miles away from the pole (which is still within the polar circle, though). Or it can be simply added to the other oddities of the Avatar world.
4. In the unaired pilot, Katara's name was going to be Kya. Nickelodeon's legal department was responsible for the name change.

The Avatar Returns

1. The original storyline for Avatar didn't include Earth Benders. It had a nation of fire users oppressing water users with an air monk trying to create balance between them.
2. First time Aang is shown waterbending.

The Southern Air Temple

1. Aang chooses Momo as the name for his pet lemur after it steals a peach from Sokka. This is appropriate as momo is the Japanese word for "peach".
2. The only title card to appear not over a white screen.
3. In the scene where Aang discovers the body of Gyatso, the body is surrounded by the corpses of multiple firebenders. The layout of the bodies strongly implies that Gyatso died defending himself and the Air Temple, and took down quite a few firebenders before he was killed.

The Warriors of Kyoshi

1. The name of the sea serpent, Unagi, is the Japanese word for eel.
2. Avatar Kyoshi is introduced into the show.

The King of Omashu

1. "Bumi" means "Earth" in Malay, Indonesian, Tamil, and also several Indian languages.
2. First appearance of the Cabbage Man.
3. First episode not to feature Dante Basco as Prince Zuko.

Imprisoned

1. Haru's mother is voiced by Pat Musik who is the mother of the actress that voices Katara (Mae Whitman).
2. George Takei, the voice of the warden, had first-hand experience as a child of U.S. Japanese internment camps similar, in spirit, to the internment camps of earth benders depicted in the episode.
3. The Warden mentions that the prison is made of steel and that there is nothing for the benders to use their earth-bending. Later in this series and in the sequel series, Legend of Korra, Toph learn the special earth-bending skill of metal-bending.

The Spirit World: Winter Solstice, Part 1

1. The black and white hei-bái spirit in this episode is aptly named because "hei" is the Chinese word for black and "bái" is white.

Avatar Roku: Winter Solstice, Part 2

1. This episode starts with the subtitle "War of the Elements" instead of "The Last Airbender".

The Waterbending Scroll

1. The "water whip" movement shown in this episode is based on the Tai Chi posture "single whip".
2. Second appearance of The Cabbage Man

Jet

1. The weapons Jet use are known by a few names: Hook swords, twin hooks, tigerheads, or tiger blades. They are three weapons in one: A long pole with a hook at the end, an arced blade above the fist, and spearhead beneath the handle.
2. First appearance of Katara's waterskin
3. First appearance of jet & his crew

The Great Divide

1. Lowest rated episode of the entire series.
2. In the episode with the play, there is a joke where they skip this episode for the sake of the audience.

The Storm

1. The Air Nomads have many parallels to real world Buddhist monks, including the way in which they discover a reincarnated leader. The method of hiding artifacts from past lives amidst mundane items and observing whether a prospective child Avatar correctly chooses the artifacts is based on one of the many tests used to discover the reincarnated Dalai Lama.
2. First time Uncle Iroh redirects lightning.
3. Princess Azula makes a "cameo" appearance - she can be seen standing next to Iroh when Ozai punishes Zuko. Technically, this marks Azula's first appearance in the show (outside of the opening credits), but she isn't identified or named this time. The viewers don't even learn of her existence for another eight episodes, and don't hear her speak for another nine.

The Blue Spirit

1. Near the end of this episode Uncle Iroh is seen playing a tsungi horn, and next to him is a small statue encrusted with red gemstones. Both of these items came to be in his possession from dealings with merchants and the pirates as seen in the episode 'The Waterbending Scroll'

The Fortuneteller

1. The same actress who voices Meng, Michaela Jill Murphy in later seasons also voices Toph Beifong.
2. The voice of Meng is the same voice as Toph who joins the team during the second season.
3. The fortune teller tells Katara that she will marry a very powerful bender, in legend of Korra it is confirmed she married and had kids with Aang, possibly the most powerful bender in existence.
4. The same voice actress for Meng is also the voice actress for Toph who plays recurring role in season 2 and 3

Bato of the Water Tribe

The Deserter

1. Near the beginning of the episode when Sokka sees Aang's wanted poster you can also see wanted posters for the Blue Spirit, Jeong Jeong, and Chet.
2. This episode marks the third member of the White Lotus introduced into the series.

The Northern Air Temple

1. This temple is where they held Sky Bison Polo.

The Waterbending Master

1. Sokka mentions to Princess Yue that in his tribe, he is 'kinda like a Prince myself' Katara scoffs and makes fun of him. Considering that their father is the Chief of the Southern Water Tribe, it would be correct to assume that Sokka and Katara should be regarded as a Prince and Princess, respectively.
2. The martial art style that Waterbending is based off of is T'ai chi ch'uan, specifically the Yang style.
3. The name of the princess "Yue" means moon in chinese

The Siege of the North, Part 1

1. When Sokka is getting his mark to be in the infiltration group, a song is playing. This is also the song that Uncle Iroh is singing on Zuko's boat when Zhao comes to take his crew.
2. If the continuation of bloodlines exist into the Korra era, then Yue would be a relative of Avatar Korra
3. 'Yue', the name of the princess from the Northern water tribe, is the Chinese word for Moon.

The Siege of the North, Part 2

1. This would the final episode directed by Dave Filoni.
2. This episode marks Azula's second on-screen appearance, after Chapter 12.
3. This is Michael Dante DiMartino and Bryan Konietzko's (the two show founders) favorite episode.
4. This would the final chapter directed by Dave Filoni.
5. After the moon spirit is killed, everything turns to grayscale. However, Yue's eyes remain blue because the moon spirit is alive in her after saving her as a baby.
6. The final appearance of Admiral Zhao in Avatar the Last Airbender
7. The underground library Zhao is referring to belongs to the spirit Wan Shi Ton. The group seek it out in the episode 'The Library' in the second season. This is where they find valuable information about a solar eclipse which they try and use to their advantage in an effort to defeat the Fire Lord in the third season.