When Earl's sister, Pearl, a country singer, shows up and the two of them sing together at the end of the episode. It's really very sweet.
Earl's speech to Robbie at the end of the two-part "Nuts to War" episodes.
Baby spending the two episodes in a Wile E. Coyote/Road Runner battle with a Cookie Creature, only for him to discover that the creature is only stealing to feed his little ones and Baby lets them have the cookie. Considering that Baby is kind of selfish this speaks volumes.
The episode, The Golden Child can be summed up in one word: "Daddy."