Nice find, boomtime!
I'll most likely use this in the future so thanks!
Talking about exploitable Barcelona glitches, here's one doable in timed gamemodes without forced stop at 0, if you end your combo after 0 and land right before entering any of these catapult doors, your score will be added (if TA, in Graff it will add tags obviously, in CM you know the result) and you'll start a new combo, despite finishing one recently, just like you were still going.
So 2 reasons why not to play Barcelona too often online!