The Gemara in Eiruvin discusses the Aramaic of Yehuda and the Galil.
Like Sam said, the difficulty is more in the manner of talking than the words used. Also, according to some explanations of certain Sugyos, the yerushalmi can bring a Raaya from a Braysa, and if not for the whole Shakla Vetarya in the Bavli we would never know what was meant.
The truth is I have no idea who worked on the Yerushalmi. It is never referred to as a finished or atonomous Talmud, in the Bavli.