If there's an item in the newer mario kart games that behaves like the blue bubble, then they stole the idea from CTR. Through double dash, I can't recall an item that offered 100% protection, and only went away after blocking a strike.
Also, mario kart had the jump boost mechanic added in mk64, but you couldn't initiate an actual extended boost by power sliding and properly timing button presses. Again, if that's been added to recent MK games, it was stolen from CTR.