How were Hugo, Sayid and Kate persuaded to board the plane? Why were they so sheepish with Jack as to why they decided to go back to the Island?
Obviously Sayid has been forcibly put on there, Kate seems to have done this under duress, but Hugo was looking at Jack in the same way that he used to interact with Dave (his imaginary friend). Did anyone else think this?
I think they must have been visited by one of the dead characters or shown their potential fates if they chose not to board the plane.