In series 2, episode 2, at around the 35 minute mark when the camera goes underwater to show the shark swimming past, the shark has the Dharma logo on the back end of it. See more...
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Continuity: Ses. 5, ep. 5, "This Place Is Death". When Daniel is telling Charlotte that he has a plan, and explains, "When we were back at the hatch, I talked to Desmond", he places his left hand on top of his right, holding Charlotte's hand between them (seen at bottom of the screen). When the angle changes to a shot above his shoulder, his left hand is suddenly back under Charlotte's head, with no time to move between shots.