Revealing mistake: Episode 4-4 "Eggtown": When Locke is in the basement hallway, he slams Ben's breakfast tray against the wall. The wall moves like it's thin plywood. Odd since basements are either thick wood or concrete over packed earth. (00:02:30)
Continuity mistake: When Kate and Sawyer start arguing, Sawyer's hair changes back and forth between shots from being parted to combed back.
Answer: He was eating a peice of an orange with the skin still on.
XIII