Continuity: When Jack shows Locke the case with guns, the bar trim beneath the handle is whole and unbroken. However, in "Whatever the Case May Be" when Boone tries to open the case without the key, the trim beneath the handle breaks off and is damaged.

Other: Ethan kills one of the survivors. Sawyer thinks it's Steve but Hurley corrects him and tells him that it was actually Scott. They make a point of Scott being the deceased and Steve being the one people mix him up with. According to the actors playing Scott and Steve it was in fact Steve who got killed but the producers messed it up.

Deliberate "mistake": The face of "Ethan" that Jack tackles is seen briefly, but it is obviously a stuntman, not William Mapother.

Factual error: Lucy says that the stolen cigarette case was pulled out of Charlie's pocket by the "EMTs". But Lucy is British, and paramedics are not known as EMTs in Britain.

Continuity: When Jack shows Locke the suitcase full of guns, you can see a stick visible in Locke's right hand. However, when Jack asks if Locke knows how to use a gun, you can see that after the camera has panned around, Locke is now holding the gun with both hands, with the stick nowhere to be seen.

Plot hole: While searching for Ethan, Jack hands out handguns to himself, Locke, Sayid, Sawyer, and Kate. But later, Charlie shoots Ethan with a mysterious sixth handgun. While this benefits the plot (Charlie's desire for revenge), it contradicts earlier episodes where it is established that there are only five guns on the island.