A lot of the humor in this episode, as well as others, came from how the VAs delivered their lines. While I can't remember a lot of what Roger and Stan said specifically, I -do- remember laughing quite a bit.
And I liked how Stan actually had to learn how to cry, and how Steve's attempts to tug at his heartstrings were all shot down. (though I could've swore we saw Stan cry in previous episodes... or am I remembering wrong?)
Pie subplot didn't do much for me, though.