Continuity mistake: In numerous shots of individual characters, while on the island, the sweat stains on their clothing significantly and repeatedly change, or disappear and reappear between shots.
Continuity mistake: Hugo "Hurley" Reyes is required to purchase two tickets because of his weight, and is the last person to enter the flight. At the end of the episode, Hugo sits next to an Asian man, while there are other people behind him in line.
Continuity mistake: Throughout the show the grime and dirt on people keeps disappearing and reappearing instantly.
Character mistake: Throughout the whole series Jin and Sun refer to each other as "yobo." The subtitles continually translate "yobo" as either "Jin" or "Sun" which is incorrect. "Yobo" is Korea's version of "dear" or "sweetheart."
Factual error: Jack's scar on his left lower abdomen is reportedly from appendicitis. The appendix is on the right lower abdomen.
Factual error: This is across the whole show, but made perfectly clear in the episode "The Whole Truth" (Season 2). Korean women do not change their last names upon marriage. A woman in Korea cannot be identified by name as someone's wife. And they would never be addressed that way. But Sun's fertility doctor addresses her as "Mrs. Kwon". Korean women can adopt their husband's family name if they move to a country where that is commonplace, but Sun was still in Korea at this point, and even after they crashed on the island, she had only just left the country.
Answer: He was eating a peice of an orange with the skin still on.
XIII