Continuity mistake: When Jack speaks to Michael and Jin, as they build the raft, and then when he walks up the beach and inquires about Sawyer's trouble with his head, the backpack that Jack carries on his back is nylon, black/green with white trim. Yet, when Sawyer asks, "Sensitivity to light, that bad?" the backpack is suddenly transformed into a solid black leather, of an entirely different style. Then, in following shots it jumps back and forth.
Deliberate mistake: As Ray drives the pickup truck, an oncoming vehicle beeps and the marshal heads behind Ray's pickup. In the shot through the cab's rear window facing the bed, as the marshal pulls behind, the bed's side wall interior is seen (note the metal loop tie down on top) and the entire tailgate is gone; yet the tailgate is intact later, when the pickup flips over. The tailgate was removed for the shot to allow visibility of the marshal's vehicle.
Continuity mistake: When the marshal and Ray drive their vehicles down the long road, the endless line of telephone poles are on their left as they drive, with barren land on their right. However, when they pass the third vehicle the poles are on their right and then repeatedly change sides in the following shots. (This has nothing to do with camera angles.)
Continuity mistake: When Kate finds the pilot's wingpin in the mud, the pilot's reflection is seen in the water as he lies on the branches above Kate. When Jack approaches they all look up and in the overhead shot the pilot's position differs and he lies on different parts of the branches, note their shape.
Visible crew/equipment: While Jin is cuffed to the wreckage, Sun points to her wrist and explains in Korean, but Sayid shouts, "The cuffs stay on!" At the start of the next shot, a crewmember's arm is seen holding the reflector screen to Sawyer's left, as he makes a sarcastic comment.
Continuity mistake: When Sawyer shoots "Sawyer" there is a 15 ft tall grounded lamppost at the corner of the link fence, with an overhead curved head giving off the dramatic spot of light in the wet darkness, near the trash receptacle. However, earlier when Sawyer gets out of the car at the Sweet Shrimp, as he checks his gun, that towering lamppost is non-existent.
Revealing mistake: With Marshal Mars in pursuit, as Ray drives his pickup, he holds the steering wheel with his left hand, and his stiff prosthetic right arm is down at his side. When Kate grabs for the steering wheel, in the side exterior shot the stunt driver is quite noticeable, as he grips and turns the steering wheel with his good right hand/arm.
Continuity mistake: After Jin is pulled off Michael, when Sawyer removes the marshal's handcuffs from his pocket there is a very short link chain dangling - about a couple of inches. However, when Jin is cuffed to the wreckage the link chain is considerably longer - about a foot.
Other mistake: The Monster appearing in the pilot and causing the turbine to explode is a mistake (not trivia). This is actually an artefact of poor CGI effects that was left in the show in error. It was confirmed by the producers. You can see it best here: http://www.lostpedia.com/wiki/Image:Turbine_Explosion.gif.
Continuity mistake: Jin is handcuffed in season 1, "House of the Rising Sun" and the cuff remains on his left wrist until season 2, "What Kate Did" when Locke removes it. The handcuffs have a distinctive shape - a single strand connected via pivot to a double strand with the lock area. When Jin is initially cuffed to the plane wreckage, the single strand faces out at his wrist, but in following shots, in this and all the subsequent episodes, the handcuff actually switches sides repeatedly, going round his wrist the opposite way.
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.
Visible crew/equipment: As Jack, Michael, and Charlie walk up to Hurley, the camera goes to the left of Hurley and you can see a road to the right of him and directly behind him a fence. If you look closely you can see a car parked under one of the trees. This can be seen in both the T.V. and DVD versions.
Continuity mistake: When Jack, Charlie and Kate are walking through the woods and Jack is holding the transceiver, Charlie ask if he hears anything. Jack then answers "You keep asking if there's anything", while holding the transceiver with his right hand and his left hand down. When it cuts he holds on to the transceiver with both hands.
Continuity mistake: When Charlie, Kate and Jack are in the nose wreckage, to find the transceiver, there is a shot in first class, facing the cockpit, showing the glass wall with the decorative circular design. When Charlie is aboard the flight, running from the stewards, he stands beside that glass wall, and the circular pattern is reversed. Neither shot is flipped.
Continuity mistake: When Boone tosses the statue out of the plane, in the close-up the entire statue shatters, and the heroine bags spill out as the head flies off to the side. But in the following shot, Locke picks up a large unbroken piece - the head and torso are intact with some bags still inside, and even that piece changes in the next shot.
Continuity mistake: When Kate and Sawyer happen upon the lovely waterfall, Sawyer removes his shirt and he has the bandage tied round the stab wound on his upper arm. When underwater, there is a different dressing on his arm; it is snugger, with no ends - most likely an elastic type to stay put during the underwater shots.
Continuity mistake: When Jack removes the paper with Kate's mugshot from the marshal's jacket pocket, in the close-up of the paper there is no writing at the top center of the paper, only at the sides. However, in the previous shot the center writing is visible from behind, and is also perfectly seen when Hurley finds the paper.
Revealing mistake: When Goodwin and Ana Lucia sits down to have a break and Goodwin hands over some fruit to Ana, she says "Where do you think they got it? I mean they're not even wearing shoes", directing to the knife. If you watch in the background you can see a car driving.
Continuity mistake: When Charlie and Hurley are talking to Jack about the water, Jack then shouts something like, "I'm not making any decision," and in the background two people walk by - they move from right to left. After a cut to Charlie and Hurley when Hurley asks "Why?" it cuts back to Jack, and the same two people walk from right to left again.