A clip from tomorrow's season finale was shown: Jack, Locke and Kate discuss the possible instability of the dynamite. If they each carry some, and there happens to be an explosion, at least they won't all die. They're planning to blow the hinges off the hatch.
We'll get several glimpses of the monster, which Matthew prefers to call "the thing". Kimmel tried to find out how many legs it has. Jack says what we'll see won't confirm the number of legs, or even if it has any legs, but it shouild cause our opinion to lean in a certain direction.
He said someone would die tomorrow. Kimmel figures it's Arzt - Matthew wouldn't confirm or deny.
Matthew thinks the first season has covered about 45 days.
He also said that probably only he and Terry O'Quinn (Locke) would be spending the summer in Hawaii. The rest of the cast still have roots on the mainland.
Ellen DeGeneres was asking about his penchant for skinny dipping, and tried to get him to go naked in her hot-tub, but no such luck.