Kate said it herself,

Usually when people lie they can't look you in the eye.. You did the opposite.

I think this is some sort of clue....I dunno but Jack is apparently possessing mad lying skillz if he can impress Kate the liar xD

Yeah, ya know, that line struck me too. Jack seems to be doing it (lying) so easily at the Oceanic press conference. All the others seem to be struggling.

Something isn't right with Jack.

Ummmm... Could it be that load of horse ca-ca he was telling at the press conference??? Uh - I don't recall that being the way things happened! LOL!

Some of the best liers in the world are Doctors. So who better to tell the O6 story? The best lier in the group.

anyone else think he had alot of grey hair on the plane that he didn't have on the island.