Continuity mistake: When Kate and Sawyer start arguing, Sawyer's hair changes back and forth between shots from being parted to combed back.
Continuity mistake: When Kate is aiming the gun at Juliet and The Other Woman, the person she is aiming at changes depending on the angle.
Revealing mistake: 4-3: When Sayid closes the woman's eyes in the hotel room, it is clear he doesn't touch her.
Factual error: When Michael and Tom end their phone conversation, we hear a dial tone. But cell phones do not emit a dial tone when a call is disconnected.
Continuity mistake: 4-3: When Sayid is in bed with the woman, his position changes depending on the angle.
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: 4-3: When Sayid has shot the man on the golf course, he lowers his arm twice. (00:05:40)
Continuity mistake: Towards the end of the episode, when Locke is preparing to shoot Ben, Ben starts talking about Charlotte and her team. Locke is then holding his gun in his right hand, and holding Ben with his left. As Ben is saying "Because I know what they're doing here", there is an angle change, and Locke is suddenly holding his gun with both hands.
The Beginning of the End - S4-E1
Continuity mistake: Season 4 - The Beginning of the End - Hurley is swimming in the ocean. He sees Desmond return with the boat, and by the time he gets out of the ocean and walks over to Desmond and yells, "Where's Charlie?" his shirt is dry with sweat stains on it.
Continuity mistake: Ep. 4-12 "There's no place like home". In the first flashforward, the Oceanic representative talks to the survivors about meeting the press. As she finishes by saying, "See you on the ground", you can see baby Aaron on Kate's lap, and she is holding his left hand in hers down by his side. Cut to a close-up of Kate, and Aaron suddenly has both hands free and is holding them up to his mouth. (00:02:25)
Continuity mistake: Episode 4x11: The man who visit young Locke at his home places a knife on top of a comic book. The position of both objects keeps changing all the time without anyone touching them.
Visible crew/equipment: S4xE8 "Meet Kevin Johnson": Near the end, Karl has nothing in his left ear when he and Alex sit down and start talking, but when Karl falls onto the ground, the actor has a wireless earwig device in his left ear in his close-up, before Alex turns him over. Then, when Alex sits by the tree distraught, Danielle tries to convince her to listen, and in Alex's extreme close-ups, she has a mini lav mic (similar style to DK3 series) at her right ear that becomes visible.
Cabin Fever - S4-E11
Continuity mistake: In the scene just after John Locke's teenage mother runs from the hospital room, the nurse converses with the grandmother. You can see her put a cigarette to her mouth with visible lipstick stains on the wrong end of the cigarette, possibly from previous takes. (00:32:10)
Continuity mistake: S4xE8 "Meet Kevin Johnson": Near the end, Danielle, Alex, and Karl stop for a couple of minutes to drink water, and when the bullet hits Karl's water bottle, in the close-up we see the low level of water inside the water bottle directly above the leak, but in the next shot there's much more water inside the bottle above the leak.
Continuity mistake: Just after the title sequence, we see Faraday holding a map in two hands in a close-up, but with one hand and one hand pointing at the map in a longer shot. (00:10:40)
Continuity mistake: When Sayid finds all the passports, he opens one and the way he holds it differs between camera angles. (00:25:00)
Continuity mistake: When Sayid sits down in the café, the woman he sits opposite is playing with her hair in the shot facing Sayid, but has her arm down in the shot facing herself. (00:06:33)
Character mistake: When Jack and co find Frank, we see Jack checking for a pulse and declaring there is one. However, Jack is using his thumb to check for a pulse on Frank's wrist. As a doctor, Jack would know your thumb has its own pulse. (00:33:40)
Continuity mistake: In Tunisia, we see someone grab a newspaper and hold it by the side and top in a long shot, but from opposite sides in the close-up shot. (00:22:10)
Answer: He was eating a peice of an orange with the skin still on.
XIII