It says in Sanhedrin Daf 24a:
מאי בבל א"ר יוחנן בלולה במקרא בלולה במשנה בלולה בתלמוד
This is very interesting that the statement is being made by R' Yochanan. He was from the first generation of Amoroim in Eretz Yisrael (Someone not even from Bavel and far from the time when the Talmud was completed) and from his Beis Medresh came Talmud Yerushalmi.
What relation does he have to make such a statement about Talmud Bavli (when certainly the same could be said about Talmud Yerushalmi). Although perhaps only a "historical" question it's still a little interesting why the gemorah is quoted this b'shem R' Yochanan.