Mouthful - Quite a few arguments, but mainly about Miles's prediciment at the end
A Lie Too Many - Alot of Lies!!
Enter Him - We found out who 'Him' was from the season 3 finale, and the episode also revolved around the mystery of the son.
The Lack Of Democracy - Mainly based on how the two leaders are different (Locke being the one who doesnt run a democracy), but you could compare it to the FF?? maybe
What Kate Did... Next 