i am surprised no one mentioned things like T-Bag eating a person ("You had some bad Mexican?"), or a nod to continuity (i.e. Michael Schofield having a sham-but-not-yet-dissolved-marraige from 1st season), or Bellick being an extreme Mama's boy!
Also, just so you know, I have a poll asking who you think will die this season
, based on the Scylla thing they were pounding us over the head with.