With the recent revelations about Wally in the latest issue of Flash, I figure this would be a good time to go through the other ways that DC creators have tried to get out of ill-advised creative decisions or erase stories they wish hadn't happened.
My all-time favorite has to be Superboy-Prime's hissy fits causing DCU history to hiccup every time he hit the Source Wall. Five stars for that silly bit of retcon explainering
The runner-up is the idea that Sinestro infected Hal Jordan with a Giant Yellow Space Parasite to explain away his sudden bout of murdery-ness in Emerald Twilight, while also giving them a way to erase the gray temples, and the generally poor characterization he'd had during the post-Englehart era.
Next up is how they walked back the outrageous notion that Leslie Thompkins murdered Stephanie Brown to teach Batman a lesson about endangering underage kids to the equally outrageous idea that Leslie Thompkins faked murdering Stephanie Brown to teach Batman a lesson about endangering underage kids, but Batman already figured it out, which is why he stiffed her by not giving her a memorial costume in the Batcave like he did Jason Todd.
What are your favorites?