Continuity mistake: Season 3, episode 2, "The Glass Ballerina". When Jin is in the hotel and is about to kill Jae Lee, he holds a pillow to Lee's head and presses his gun against it. At first, the gun is pointing to Lee's cheekbone, but when it cuts to Lee as he is sobbing "I'm sorry. I'm sorry", the gun is much lower, and pointing to his throat. Cut back to Jin, and you can see the gun is once again pointing to Lee's face. There was no time for Jin to move it between shots, and Lee did not move nearly enough to cause this changes.
Continuity mistake: In episode "Through the Looking Glass"When Jack walks into the funeral parlor he looks at the coffin, the small part of the lid is to Jack's left, when they show you the coffin from the top the small part of the lid is to his right.
Continuity mistake: When Sawyer helps push the minivan, there are small holes on his tee shirt's collar and a large hole on the seam of his left sleeve. When he walks back into camp with the beer, the large hole is now on his right sleeve, and the left is intact. Neither are flipped shots.
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Continuity mistake: When Sawyer is put back in his cage after being given a pacemaker, he dips the sponge in the bucket straight away. As soon as the shot begins when Sawyer is looking at Kate undress, he is holding a completely dry sponge in his hand.
Continuity mistake: Episode 3-16, "One of Us". When Juliette and Ben are talking towards the end, Ben is first seen with his hands folded (fingers interlocking) in front of him. Just after Juliette says "I'll admit to it, tell her it was the only way to gain her trust", Ben's hands are in the same position, but are not folded, his right hand is just lying on top of his left. Cut to a close-up of Ben, and his hands are once again folded.
Continuity mistake: When the entire camp is heading up to the radio tower they head up the beach with the water on their right side. After the title screen shows they are walking with the water on their left side. They are going in the opposite direction as before.
Continuity mistake: When John loses his voice, he uses a pad to communicate with Charlie. He writes "I need you to stand guard" in one scene and later shows the same message to Charlie. In the second scene, although it is supposed to be the same message, guard is misspelled "gaurd."
Continuity mistake: Episode 3-17: Juliet is shown crawling out of the sub. You see a side street where she is crawling over an uneven area to a dock about four feet away from her. When the shot pulls back, the dock is nowhere near her - she was crawling on a different dock.
Continuity mistake: After picking up Eddy the hitchhiker, John and his passenger can be seen driving through a compound. As they drive through the compound, a passenger can be seen in John's pick-up truck. The scene just before they arrive at the sweat lodge, there is no passenger. Once they arrive at the sweat lodge, a passenger exits the pick-up truck.