In the opening chapter to WOK, Szeth is at the feast to assassinate Gavilar and comes across a beggar in the beggar's feast who says the characteristic "Have you seen me?" of Jezrien.
Also, just for fun, Sanderson included a note about how there were only statues of nine of the ten heralds and that Shalash (Ash) is conspicuously missing. I love these little tidbits found upon rereading.