Visible crew/equipment: As Locke and Eko descend down the hatch a safety cable can be seen supporting Locke.
Continuity mistake: When Locke and Mr. Eko watch the Orientation video in the pearl station Dr Chang has both arms and the screens behind him show people working in the swan hatch. His arm was badly damaged in the incident before the swan hatch was built and he should.have had a prosthetic arm when the pearl video was made.
Answer: He was eating a peice of an orange with the skin still on.
XIII