Aligning Tiberias and Tzipori (and Ginosar) with other places named in the Bible (of course, debatable). One of the ways of proving the case was from eulogies for those who had enough renown to be mourned in both Israel and Babylonia. Plus, a note that Edom was used as a stand-in for Rome, and antipathy to Edom reflected Chazal's antipathy to Rome. Also, differences between Adar I and Adar II. And the special parshiot that are read a few weeks before Purim and thereafter. (What if you goof in the timing??) And important proximity to Nisan (which is to say, Pesach) over Shevat* (recorded as Tevet in a verbal typo).