I'm sorry but it was a long time ago, all I have to go with now is that in one episode someone (kid?) went back to ancient china (like BC ancient, I remember a zhou dynasty) to find some magic thing, there's a shot of the royal palace which were some caveman tier building, royal guards flabbergasted by a flashlight. Jackie Chan might? have been in it, partly because non of the episodes from Jackie Chan Adventure I've checked had what I'm looking for