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 solid black leather, of an entirely different style. Then, in following shots it jumps back and forth. (00:16:40)
Tabula Rasa - S1-E3
Continuity mistake: When Ray's pickup truck swerves off the road, it flips and the tailgate completely breaks off, yet in the following shots the bright red tailgate remains intact. (00:30:45)
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: In numerous shots of individual characters, while on the island, the sweat stains on their clothing significantly and repeatedly change, or disappear and reappear between shots.
Tabula Rasa - S1-E3
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.) (00:30:10)
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. (00:25:55 - 00:36:10)
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.
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.
House of the Rising Sun - S1-E6
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. (00:06:15)
Continuity mistake: On the airplane, the same passengers are seen in numerous shots with different main characters, and purportedly Kate and Marshal Mars (row 25) are in the same cabin on the opposite side of Jack, Rose and Locke (rows 23 & 24), yet are not seen in shots where they should be seen - though in shots of Jack and Rose, during the turbulance, the same woman and man (behind Locke) fly up as in the Kate and marshal shot. Some examples: When Kate and the marshal are shown during the turbulance, note the red-haired man with the black shirt beside the marshal and other men behind, and in one shot of Kate and the marshal, a woman and man both fly up to the ceiling of the cabin. In some shots of the turbulance, when the red-haired man is seen, the marshal and Kate are gone, replaced by other passengers. Just before the tail section breaks off, men behind the red-haired guy have either changed seats or disappeared, and so forth. Row numbers seen on the luggage compartments overhead are inconsistent with passenger seating. Such as when the tail section breaks off, the man is pulled out from row 26, yet the number above reads 13, or when Claire boards the numbers overhead are 20, 21, 22, yet Jack is in row 23, which is the second row behind the wall. The interiors of the Oceanic airplane also significantly differ in various shots. One example - the seats on the airplane have blue square velcro coverings on the passengers' seat headrests, and long, wide magazine racks on the divider wall behind Locke, but when they carry Locke onto the airplane, they don't exist.
Continuity mistake: In the earlier shows, the positions of the cuts on Kate's and Jack's faces change, as well as their characteristics.
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. (00:00:20)
Continuity mistake: When Hurley gets to Sayid who is about to fix the transmitter, Sayid puts down the battery on the case. It cuts and the battery is back in his hand and in the next shot the battery is on the case. (00:10:15)
Continuity mistake: On the airplane, when Kate lifts the glass of juice with her handcuffed hands, in this close-up the cuff round her right wrist has the single bar facing out. However, when the turbulence hits, in another close-up of her hands, the same cuff is on the opposite way, it now has the double bar facing out. (00:31:10)
Tabula Rasa - S1-E3
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.
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 Jack drops to his knees, after removing the undershirt, one white shirt lies stretched out horizontally on the ground directly in front of him, with both knees centered in front of it; the other shirt is off to his right (viewer's left), with the undershirt he drops. Three shots later, still on his knees, all three shirts lie rumpled to his right; eleven shots later, the single white shirt once again lies horizontally directly in front of him, in the very same position as the earlier shot.
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.
Whatever the Case May Be - S1-E12
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. (00:02:50 - 00:04:15)
Answer: Using a mold, a realistic pregnancy belly is made of latex (rubber), including the distinct belly button, to suit the proportions of Emilie de Ravin who plays Claire. It is then painted with a special paint/adhesive compound that adheres to the surface and for shots of the actual belly, additional veining and stretch marks are airbrushed on.