Board Thread:Questions and Answers/@comment-24240436-20131201220155/@comment-220364-20131201231134

A few things...
 * 1) New Earth was an amalgamation of what was left of the multiverse just prior to the end of COIE. It's a bit of hair splitting, but it wasn't supposed to be a delete and start from scratch.
 * 2) Immediately after COIE there were some plot points that still relied on the pre-Crisis stuff. The Legion, especially Brainiac 5, remembered all of it. And there was a planet that cropped up in Omega Men at the time that was made of wedges of equal size of the last 6 pre-Crisis versions of the planet.
 * 3) Even after those were phased out, the "Crisis" was still there. This included Barry's sacrifice but not things like the Earth-Two Bat-Family, Green Arrow, etc. What the crisis was though was either skirted around or simplified down to the anti-matter universe trying to eradicate the positive-mater one.