Sarah gets her appendix removed and recuperates in Kevin's apartment with Jamie. Jamie wants to see her scar, and offers his hairy back mole; he could have offered his appendix scar for comparison. It came up in the very first episode, Babies Having Babies (1996), where the neighbor Michelle and he talk about their appendix surgeries. Michelle said she keeps hers in a jar, like Sarah.
Kevin offers to take care of Sarah after surgery. He offers to give her a sponge bath, saying he saw it on ER (1994). Ron Eldard played Shep, an EMT and Carol's boyfriend, in seasons 2 and 3.