Some... stuff. I'll tell ya as and when. Currently pausing at an ad break in 3.22, may start typing this up afterwards.

"Retconned" is the past tense of "retcon", a fandom verb/noun contracted from "retroactive continuity", where a "fact" about the past is altered for the sake of the current storyline. i.e. "originally Milli went to the Watchers' Academy but we retconned it so she was home schooled."

I couldn't possibly comment. (But barg could, and has.)