In the scene where Madison reveals to Alicia the true cause of her father's death, she says: "There's so much of your father in Nick, you know? The way he could light up a room with his smile. Or silence it with his mood. It's impossible to ignore. You just couldn't not see it". In the pause afterwards, the audio is silent (aside from the surf), but the closed caption includes the line: "They shared the same demons."
A "Walker" doesn't appear until 35 minutes into the episode.
Following the airing of this episode, Lorenzo James Henrie appeared on Talking Dead (2011) and admitted that he too found his character utterly dislikeable.
We learn that the boys that Chris is now hanging out with had a friend called Troy who got bitten. Troy of course would go on to be the name of the chief antagonist in Season 3 (and the back end of the final season).