First appearance of Cam's father.
At the beginning of the episode, Claire and Phil discuss how to break the death of Walt slowly to Luke. Phil comes up with a very long elaborate story, in which it takes days to go from Walt having a cold to eventually dying. In Friends S2E12 a similar elaborate story is told to Ross about the (fake) death of his monkey Marcel. In both stories they temporarily get a little better, before eventually dying anyway. The zoo owner who tells Ross this, is played by Fred Willard, who also played Phil's father Frank on Modern Family.