While this clip may not seem too important, it speaks to a bigger theme that will permeate the finale. Jack shows his obsession with leaving the island, while Sawyer expresses his displeasure with that idea. Sawyer sees no reason to get off the island. It's probably more about Sawyer's lack of a life to return to than it is his reticence to trust the freighter people, though that certainly plays a part. Kate, as per usual, finds herself somewhere in the middle, which is odd, considering she has more incentive than anyone to remain on the island.
The next clip has no dialogue, and simply shows Sayid return to the beach with the motorized raft from the freighter. He is in a hurry. This is somewhat significant, in that we now know that Sayid indeed makes it back to the island.
This next clip is a bit more mysterious. Ben uses a mirror to send light signals up a hill. I wonder who he's communicating with?