Continuity mistake: When Sun is putting a hat on Jin, he says he doesn't need a hat as Sun starts to lift and put the hat on him. When the shot changes, she lifts the hat a second time. (00:14:10)
Continuity mistake: In the shootout at the airbase, one of Ecko's gunmen kills the military driver with a shot through the windscreen. When we see the jeep crash, the bullet hole has gone. (00:32:10)
Collision (a.k.a.Old Habits) - S2-E8
Continuity mistake: Ana Lucia cuts Sayid free and chucks her knife and gun down. But we see her with the gun in the left hand and knife in the right; however, when we see them land on the floor, they're the other way round. (00:34:20)
Collision (a.k.a.Old Habits) - S2-E8
Continuity mistake: Rose holds out some fruit to Jack. In one shot she holds it out with her right arm, then her left. (00:07:50)
Revealing mistake: During the fight between Goodwin and Ana, pay close attention to Ana just before we see them fall into the ravine. You can see some of her protective equipment visible. (00:35:20)
Continuity mistake: When Ana asks Goodwin about why they take some and not others, she has a strand of hair down the centre of her face. When the shot changes, this hair has gone. (00:31:10)
Continuity mistake: When Ana realises Mr Ecko gave food to Nathan, the strand of her hair covering her face changes between shots. (00:24:20)
Man of Science, Man of Faith - S2-E1
Visible crew/equipment: Just as Sawyer's raft falls apart, we get a shot of Michael on his raft. In this shot, a wire holding his raft in place is visible at an angle in the water. (00:21:00)
Man of Science, Man of Faith - S2-E1
Revealing mistake: When Michael and Sawyer are on the raft and they hear the knocking on the raft, you can see the cable holding the raft in place descending to the floor. (00:10:30)
Man of Science, Man of Faith - S2-E1
Continuity mistake: When Kate drops the torch in the hatch, its position keeps changing between shots of it. (00:26:20)
Man of Science, Man of Faith - S2-E1
Continuity mistake: When Kate climbs onto the ladder of the hatch, she has both feet on the ladder from the top angle. But when the shot changes to below her, she still has 1 foot on the edge of the hatch. (00:24:50)
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.
Continuity mistake: When Mike and Sawyer climb onto the pontoon (after Mike shoots the shark) there is a long wooden beam protruding to the left of the pontoon. In the next shot (morning, where Mike is crying) the beam protrudes the other way. (00:35:00)
Continuity mistake: When Libby kisses Hurley at the cliff, there is a strand of Libby's hair which you can see hanging freely over her left cheek when the camera is on Hurley. When the camera is on Libby you see the same strand pinched between their heads. Then as the camera switches back on Hurley the strand hangs freely again. It's not possible that this happened only through the force of wind as their heads are stuck together quite tightly throughout the whole kiss.
...And Found - S2-E5
Continuity mistake: When Jack calls Sun on the beach, there is no one near her. When the shot changes to a close-up, someone is walking past her. (00:07:40)
Audio problem: Goodwin states, "the hills are blocking it," referring to the radio signals. However, the audio is of Locke saying the line. (00:30:20)
Suggested correction: That's Brett Cullen's voice.
...And Found - S2-E5
Character mistake: When Sun rips up her garden, she sits down with her arms crossed and head against her arms. In these shots, the position of her hands, the dirt on her hands, the dirt on her watch, all change between shots. (00:22:30)