No point in blogging extensively about it, but the final debate found Trump lying less bombastically, forcing the (much better) moderator to allow him to reply to everything. Biden was strong and steady, giving long and nuanced and thoughtful answers.
Best bits for Trump: Trashing Biden as a career politician.
Best bits for Biden: The rest, with the exception of baldly stating that oil will be phased out, which might make Texas think twice. I especially liked Biden stating that Trump's “a dog whistle as big as a foghorn.”
I didn't see anything as trajectory-changing.