In the comics, the Sgt who appeared in last nights episode appeared before Hershel's farm in the comics. So very different to the tv version.
DH too thinks that Carol looked shocked by tyreeses reaction because he doesn't know and rick told her that he would know! Which is why he made he leave.
The prison attack did happen just after Rick returned from relieving Carol. Also the radio signal we heard back in earlier episodes of S4 must be from Terminus.
The writer and producer said if people re watch the first half of S4 it gives ALOT if clues as to what's coming up in the second half. I.e the radio signal is a massive clue.
Remember what it's was saying 'SAFE SAFE'
Terminus is detailed as safe place
All survivers stay alive.
Can't wait for next week.
Just hope they all meet up soon, hope they don't leave it until series 5!