The Tales of Ba Sing Se - S2-E15
Other mistake: The Tale of Sokka: When Sokka delivers his final haiku to the girls, he inadvertently adds an extra syllable to the final line. In the close-up of him counting his fingers, the iris of his left eye is rendered over his hand. (00:14:42)
The Tales of Ba Sing Se - S2-E15
Other mistake: The Tale of Aang: After Aang lets all the animals out of the zoo, he takes out his bison whistle and blows on it. As he does so, the way he holds his staff makes it so that it's going right through his head. (00:10:28)
The Tales of Ba Sing Se - S2-E15
Audio problem: After Toph deals with the bullies, she explains that she does not care what she looks like. The lip syncing is off. (00:04:09)
The Tales of Ba Sing Se - S2-E15
Continuity mistake: The Tale of Zuko: When Jin and Zuko are at the restaurant, some of the items on their table constantly disappear, reappear, and change position depending on the shot. (00:16:30)
The Tales of Ba Sing Se - S2-E15
Audio problem: The Tale of Toph and Katara: Right after the scene of Toph and Katara at the Fancy Lady Day Spa, as Toph says, "Well, that wasn't so bad. I'm not... I actually feel girly," her lip movements are out of sync. (00:02:34)
Answer: The pirates are from the episodes "The Waterbending Scroll" and "The Waterbending Master" (They're the ones Katara stole the scroll from). The traveling musicians are from "The Cave of Two Lovers. The prisoners of war likely refer to the Kyoshi Warriors, the men of the Southern Water Tribe, and possibly Bumi and the other citizens of Omashu.