A questioner asks them to comment on "monster forms"; whether certain things are human, apparition, animal, dead, etc.
Ben's mother Emily = "Apparition."
Sawyer's wild boar = "Animal."
Medusa Spider = "Monster."
Hurley bird = "Oh, I'm not gonna comment on that."
Dave = "Figment of imagination slash apparition."
Yemi = "Monster."
Mikhail's cat Nadia = "Animal. And coincidence."
Walt = "Walt the person is a person. But there are apparitions of Walt that may not be Walt, and also monster-related."
Boone in Locke's dream = "Dream."
Jack = Damon: "Heh. Jack is an apparition. That's gonna be the big twist at the end of this season. He's not only in the future, but he's not real." Carlton: "No, no. He's making a joke!" Damon: "Yes."
Kate's horse (and Yemi and Christian Shepherd)= Damon: "We have this, this is actually a funny story. We have this board in the um, in the, in the room. With all the actors in the writers room. With all the actors who are on the show. All of the Oceanic 815ers. But then, all of the sort of recurs, like Penny Widmore, and Charles Widmore and..." Carlton: "We have their headshots. So we can keep track of who we have on the show." Damon: "And Matthew Abaddon and... yeah, so everybody. They go onto a door that says "deceased"; once they die, we move them over there. And then there's the door that says "undead". And on the undead door there's only three pictures. One of them is Christian Shephard, and one of them is Yemi. And the other one is..." Carlton: "Kate's horse. Just a picture of a horse. So Kate's horse is undead."