Mordechai interpreting the words of 3 women who came with Offerings, to understand their intent: Menachot 64b-65a
Mordechai was generally responsible for the money used for bird-Offerings, under the name "Pesachyah" alluding to his interpretive abilities: Menachot 65a
Mordechai exiled himself from Jerusalem when the Jews left: Megillah 13a
Some of Mordechai's fellow judges abandoned him when he became a public ruler: Megillah 16b