Now you mention it, Fishy's story is goddamn tragic. I didn't pick up on it because in Paolini's usual fashion it's just treated like a horrible monster and nobody spares it any sympathy at all.

Durza did make it so that no one could ever hurt it again like those boys tried to. Maybe, in order for it to live for so long, he went back to visit it. It might have even been his pet. And after he died, there was no one to defend it. .... ... Goddammit, I'm sad now.

I just hit the big one, which came with the bonus revelation that, yes, the joke about there being Barbie Pink dragons is in fact true. (Well it says "puce", but I looked it up and... yup, that's Barbie Pink).

I think I know which retcon you mean. I was quite annoyed at that one. I think it took away from the characters. Also, I've always thought of puce as being along the darker shade of the gradient linked below, but I suppose if a dark puce dragon and a white dragon mated, they could get a Barbie pink one.

https://duckduckgo.com/?q=puce+color&iar=images&iax=images&ia=images&iai=https%3A%2F%2Fcolorswall.com%2Fimages%2Fpalettes%2Fshades-of-puce-color-cc8899-hex-27089-colorswall.png