I remember those debates in TS fandom about how the canon was never really clear about Jim's birthday and age, and the issues with differences between prop canon and what is shown in the flashbacks in some episodes, and how sometimes the months between the episodes don't really line up with the shown season of the year in a coherent chronology etc. And I remember how everyone used to bitch that the canon was so inconsistent.
Hah. Trying to just get a basic idea what pieces of canon are still valid and what has been retconned for just a little part of the current DC universe continuity makes me laugh at those complaints in retrospect. Current "definite" canon is more slippery than a wet fish for the DCU.
I mean, so far I've only read post-Crisis DC but not even that makes it really easier. Right now I'm reading through DCU FAQs to understand the impact "Zero Hour" had on post-Crisis continuity. Zero Hour apparently was the second retcon intended to fix the snafus and inconsistencies in the wake of their first retcon...
I get the need for retcons in comic canon to adjust it from time to time, but the way DC did it is certainly, uh, challenging. I guess I'll add the relevant "Zero Hour" issues to the ever growing list of "comics to get eventually" and hope I'll be able to figure it out at some point.
(Or at least get used to it, sort of like with quantum mechanics, you don't really understand it, but get used to it when you just use the formulas often enough...)