I know this is not really important, but I am processive person who notices little things, and I am curious, in the Boiling Rock, Zuko mentions the name of his girlfriend he had to leave behind named Mai, and Sokka said "You mean the gloomy girl who sighs a lot?"
How did he knew the gloomy girl who sighs a lot, the one that surrended Bosco without a fight, the knife throwing girl, how did he knew her name was Mai. I don't think her name was ever mentioned in front of the gAang.
They knew Ty Lee's name in The Drill because Mai spoke her name in front of Sokka and Katara in The Chase, but I don't recalle Mai's name ever being mention in the gAang's presence. I guess Sokka and Toph ease dropped on Mai and Ty Lee conversation in the Earth King thrown room before they rescued Bosco, and Mai's name came up in that conversation.
Though sometimes the gAang aren't that processive in picking up names. Mai did mention Azula's name and her position of power in Return To Omashu in front of the gAang, yet Azula had to introduce herself to Aang in The Chase.