Reason #999 why the cartoon will always be ONE MILLION PERCENT better than that travesty of a movie. They did so much research and put so much detail in you don’t even notice.
Bonus trivia: Toph got a unique martial arts style to match her distinct version of Earthbending (Southern Praying Mantis style, I think) which the creators found out later was (according to legend) invented by a blind woman. Totally a coincidence, but still so fucking cool.
(If you don’t watch the show, Toph is both blind from birth and the best damn Earthbender in the world. Also, GO WATCH THE SHOW.)
The reason why the room was pink was because on black and white film, hues of red become dark shades of black. Pink is the perfect balance to give it that dark creepy grey.
A related fun fact: while old black and white film was under-sensitive to reds, it was correspondingly over-sensitive to greens. Actors whose characters were meant to have unnaturally pale complexions - like Morticia Addams - would often take advantage of this by wearing makeup with a green base tint in order to make their faces “pop”. This is where the modern trope of cartoon vampires having green skin comes from.