2x05, Simon Said: Cute little Andy :) But I didn't understand why Sam who was such a computer whiz had to go to Ash to look up a simple bus sign! Every library carries computers where he could have simply googled it. Nor did I like Ellen's bully attitude at the end. I mean, I like Ellen, she's pretty cool but she overstepped every boundary there.
2x06, No Exit: Yet another Road House ep. You know, marathoning the eps like this, you realize how... overused the Road House crew and especially Jo were in the first handful of episodes. This ep was actually pretty cool, the concept I mean. But by this time, I was so annoyed with Jo that I couldn't actually enjoy it. And in this particular episode, Sam was reduced to a background figure and it was mostly Dean and Jo's scenes. Not cool. And the whole "your father got my father killed and it's all your fault" attitude pissed me off, like totally.
2x07, The Usual Suspects: I liked the "mental link" between the brothers here, them basically reading each other's thoughts. After 2x06, it was great to see them "smart" again. And heh, trying to turn Sam against Dean? Like for real? Pft! ;P
2x08, Crossroad Blues: My favorite episode of these four. I loved the scene where Dean told Sam that he thought their father had made a deal for him. And then the very last scene in the car, when Sam asked if Dean meant it, if he really considered making the deal. And Dean didn't answer. Sam's look there... Great foreshadowing!
You know, truth to be told, the episodes with Jo are kinda lame. If they had used her twice or three times per season and spread the episodes out, I wouldn't have minded. But it was just too much, too soon. In S1, it was just the boys. At the beginning of S2, they threw new characters in and used them in every episode. It felt like watching a completely different show. All of a sudden, the boys didn't do their research, they always asked for help, asked for information instead of looking it up... It didn't ~feel~ like SPN.