White Rabbit - S1-E5
Continuity mistake: When Charlie and Hurley are talking to Jack about the water, Jack then shouts something like, "I'm not making any decision," and in the background two people walk by - they move from right to left. After a cut to Charlie and Hurley when Hurley asks "Why?" it cuts back to Jack, and the same two people walk from right to left again. (00:10:30)

White Rabbit - S1-E5
Continuity mistake: When Sawyer asks of Boone, "So how does it feel?" Boone sits with his knees up and his arms crossed over his knees, but in Boone's close-up he sits normally with legs down, arms uncrossed. Then, as Sawyer walks away Boone sits just as in the first shot. (00:40:15)
Answer: He was eating a peice of an orange with the skin still on.
XIII