yeah the jater/skater thing has been going on for a while now.
as i was watching last night, i was thinking about something. on the island, in all of the closeups of jacks face, he has gray mixed with brown stubble. but we see him off the island presumably a few years later, his beard is fully brown with no gray whatsoever.
its probably just a continuity error with the fake beard and matt fox's real facial hair, but all the closeups on his face throughout the episode made it hard not to notice, for me.