Continuity mistake: When Kate and Sawyer go underwater to retrieve the case, in a close-up it is easy to see that the male corpse is barefoot. But in a following close-up, when Sawyer swims up with the Halliburton case - just as the words "Production Designer Carlos Barbosa" appear onscreen - in this specific shot the man is actually wearing a black shoe on his left foot.
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Continuity mistake: When Sawyer is put back in his cage after being given a pacemaker, he dips the sponge in the bucket straight away. As soon as the shot begins when Sawyer is looking at Kate undress, he is holding a completely dry sponge in his hand.
Continuity mistake: Ana-Lucia says that she never saw Nathan during the two hours the plane was in the air, which Cindy the flight-attendant agrees with, saying that she has a photographic memory for passengers. But the plane was actually in the air for eight hours before the crash, as revealed in the pilot, so, not only should Cindy remember him after that long, but they all should be able to tell the difference between two and eight hours.
Continuity mistake: When Marshal Mars pulls behind Ray's pickup, as the third vehicle beeps, the camera pans to the back of the cab. The cab window, behind Kate and Ray, is slid open to allow a clear view of the marshal pulling behind. In previous and following shots, the windows behind them are closed.
Continuity mistake: After Kate and Jack dig up the marshal's body, Kate opens his wallet. In this close-up, as the pocket for bills is at the top, the vertical slit with his ID is on the right and the horizontal slits with laminated cards are on the left. However, in the close-up when Jack holds it, as the pocket for bills is again at the top, this time the vertical slit with his ID is on the left and the horizontal slits are on the right. Surprisingly, neither are flipped shots. Two different wallets were used in each close-up, though similar in style, the storage slits are on opposite sides.
Revealing mistake: When Shannon carries and drags the luggage (some of Boone's) she breaks down and Sayid speaks to her. When he says, "It won't be too much if I carry it for you," he strokes her cheek with his left hand - note the watch. After he says, "I have a hike to lead," in the next wideshot he's still holding her face with his "left" hand. But, note the lack of watch, and her large suitcase is now backwards. They flipped the shot so his right hand would appear to be his left, to keep hand continuity, but it doesn't work.
Continuity mistake: In the scene where Michael and Sawyer are eating some fish on the beach (with Jin working on the raft) a pregnant Claire has a quick conversation with them and heads into the forest. About 20 seconds later Kate runs into Michael and Sawyer, and runs into the forest at full speed. Kate later finds Claire in labour, who somehow had gotten further out than Kate, even though Kate was running at high speed in the woods. There is no way a pregnant girl could have beat Kate to that position, even considering how long it took Jin to find them from the beach.
Continuity mistake: When Michael thinks Jin has set fire to his raft, he punches him in the face a couple of times. When Jin is leaving Sun later on, his face is miraculously unmarked. There is no sign of any swelling or bruising. He doesn't look like a guy who's just been punched in the face.
Revealing mistake: When Kate is in Ray's pickup, as they drive down the road, she looks into her side view mirror twice, over a minute apart. Firstly, the road that passes in the view reflected in the mirror is perfectly identical in both instances that Kate looks at it, which is impossible - the same shot is used twice. Secondly, the road that passes Ray's truck is completely different to the road that passes in the view reflected in the side mirror, they are obviously edited together.
Continuity mistake: Towards the end of the episode, when Locke is preparing to shoot Ben, Ben starts talking about Charlotte and her team. Locke is then holding his gun in his right hand, and holding Ben with his left. As Ben is saying "Because I know what they're doing here", there is an angle change, and Locke is suddenly holding his gun with both hands.