House of the Rising Sun - S1-E6
Continuity mistake: When Jack is packing water bottles in to the sack and Locke says "I think One of Us should stay and help Charlie salvage the wreckage", you see Jack putting a bottle in to the sack. His hands are now empty, but when it cuts he suddenly has a new bottle in his hand which he puts in to the sack. (00:16:05)