Continuity mistake: When Jack sees the casket, things lying on it change between shots. When he flips it open the ripped interior lining differs in the following shots, depending on camera angle. Then, as Jack destroys the coffin, the broken wood differs greatly between shots. Such as when the shot faces the coffin the entire top is destroyed, but when facing Jack the side frame remains intact. (00:36:35)
Continuity mistake: At the motel, when Kate asks for the envelope addressed to Joan Hart, the employee searches through the box with many envelopes sticking out of the box. However, in the next shot, as he finds it no other envelopes are visible, and when he hands it to her, her sunglasses are now upside down.
Continuity mistake: When Sayid stabs Sawyer, in the close-up there are considerable blood stains on Sayid's white shirt, yet when Jack pushes Sayid off Sawyer all the blood has vanished. This continues to happen in all the following shots, when Jack tells Sayid to get his bag, and the amount and pattern of blood also significantly changes. (00:30:15)
Continuity mistake: After Sawyer admits to Kate that he doesn't have the inhalers, Sayid and he get into a tussle. In the first shot, the back of Sayid's white shirt is fairly clean as he is standing, but in the next wider shot the back is completely filthy - before he and Sawyer ever even hit the ground. (00:30:10)
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.
Continuity mistake: After Kate and Jack dig up the marshal's body, Kate opens his wallet. In this close-up, as the pocket for bills is at the top, the vertical slit with his ID is on the right and the horizontal slits with laminated cards are on the left. However, in the close-up when Jack holds it, as the pocket for bills is again at the top, this time the vertical slit with his ID is on the left and the horizontal slits are on the right. Surprisingly, neither are flipped shots. Two different wallets were used in each close-up, though similar in style, the storage slits are on opposite sides. (00:28:05)
Continuity mistake: After telling Danielle what is written on the back of Nadia's photo, Sayid steps closer to Danielle. When Sayid says, "The only way off this place..." in the shot facing him Danielle holds the gun up high and points it straight at Sayid's chest. Yet, in both the previous and following shots facing Danielle, the gun is pointing down towards Sayid's legs. She then lowers the gun and sits down.
Continuity mistake: When Marshal Mars pulls behind Ray's pickup, as the third vehicle beeps, the camera pans to the back of the cab. The cab window, behind Kate and Ray, is slid open to allow a clear view of the marshal pulling behind. In previous and following shots, the windows behind them are closed. (00:30:15)
Continuity mistake: When Tom removes the toy airplane from the lunchbox, the three propeller pieces are completely broken off of the left wing engine (all are intact on its right wing). Yet, earlier on the island, when Kate twirls the airplane in the air, before Charlie joins her, the left wing engine has grown one piece of propeller that is unbroken. There are other moments such as this, in other episodes. (00:02:40 - 00:23:50)
Continuity mistake: When Jin is packing to leave the cave, his backpack is wide open and unzipped when he swings it onto his right shoulder and then carries the fishing net. After a brief cut to Sun shouting in English, Jin is walking away carrying the net, and the backpack is still on his shoulder, only now it is zipped closed. (00:32:15)