I have one for you that may or may not count as retconning.

I don’t know if you’ve ever seen Seinfeld, but it’s said that Kramer at the start of the show hasn’t left the building in years, yet that is never really a thing as the next season progresses. It actually completely ignores this revelation about him pretty quickly and he’s like a completely different guy soon after this and you’d never think he was this recluse who never left his apartment for years.