Continuity mistake: When Shannon is looking for Boone but instead finds his "jungle pal" Locke, he is gutting his dinner and gets blood on his face. The blood on Locke's face repeatedly changes, such as in one shot there's a small clot of blood beside his eye, and in another shot the blood is lower and larger. (00:19:00)
Continuity mistake: Once Sun leaves the bathroom, Jin's hands begin to shake as he washes the blood off, in fact there is much more blood on his hands now to wash off. Suddenly there is a silver/red soap dispenser on the right of the faucet (this isn't the gold/red one on the left), where the bar of soap was earlier, and there are also two large white towels hanging on the bar, whereas there was only one in all the previous shots. The early part of this flashback is in "House of Rising Sun" and the additional last shot was filmed at a later date. (00:25:25)
Continuity mistake: When Shannon is talking to Locke about Boone staying out of her business, her hair changes between each shot. It is very noticeable, she goes from having no hair on her face, to having a lot hanging down the side of her face. (00:19:30)
Continuity mistake: When Jin is packing to leave the cave, his backpack is wide open and unzipped when he swings it onto his right shoulder and then carries the fishing net. After a brief cut to Sun shouting in English, Jin is walking away carrying the net, and the backpack is still on his shoulder, only now it is zipped closed. (00:32:15)
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. (00:26:20)
Continuity mistake: When Sawyer says to Sun about lying, his hair is windswept. When the shot changes it's hanging freely. (00:27:50)
Continuity mistake: In the flashback, we see Jin and Sun having a meal when Jin gets a phone call. When the phone rings, the position of Sun's chopsticks changes depending on the angle. (00:20:15)
Answer: He was eating a peice of an orange with the skin still on.
XIII