I personally would class Finn as Lawful Good but that's just me.
The episode was okay.
SpoilerThis episode was really creepy. I'm kinda squeamish about organs and guts and stuff, so that contributes. >_<
In Lemongrab's brain:
Spoiler
Bottom right, above the CN logo: "Oh what a good boy am I"
Also in there: Possesed by Demons.