
Whatever the Case May Be - S1-E12
Continuity mistake: Sawyer says there's no way to open the case and that he's doing it for his own curiosity. When he does, Kate has her hair behind her right ear. Camera cuts and now it's dangling in front of her face. (00:19:30)

Whatever the Case May Be - S1-E12
Continuity mistake: When Sawyer tackles Kate for the case, her back gets dirty and has stuff stuck to it. When she lunges at the case a few seconds later her back is clean. (00:19:00)

Whatever the Case May Be - S1-E12
Continuity mistake: Sawyer drops the case from off the cliff and it comes to a rest in a unique position against a certain rocks. When we see Kate run and grab the case, it has now changed position entirely. This is not due to the camera angle. (00:18:00)

Whatever the Case May Be - S1-E12
Continuity mistake: When Kate and Sawyer are discussing what to do with the case. Sawyers hair is constantly changing. Watch the gash on his head. (00:07:00)

Whatever the Case May Be - S1-E12
Continuity mistake: Just before Kate jumps into the lake, Sawyer is climbing some rocks. Camera shows Kate jumping and now Sawyer is stood holding his arm out to her. (00:03:45)

Whatever the Case May Be - S1-E12
Continuity mistake: When Kate confronts Sawyer, her bag strap is across the centre of her chest. A few shots later the bag is now to the left side of her chest without being moved as this would have been seen in previous angles. (00:01:45)

All the Best Cowboys Have Daddy Issues - S1-E11
Continuity mistake: When Locke ties the red strip to the first tree, he then stands free of the tree. When the camera changes he's now leaning against it. (00:11:20)

Continuity mistake: Charlie comes across Ethan who has some logs in his arms, including a distinctive L shaped one. When he drops the logs a few seconds later they have changed in number, size and shape. (00:34:10)

Continuity mistake: Charlie states if he can kick drugs, he can do this, referring to helping Claire. When he says this he raises both index fingers and points at her. Camera changes and now his hands are open, palm down. (00:30:25)

Continuity mistake: When Claire finds out she is pregnant, her hair is either messy or neat depending on the camera angle. This is most noticeable when Thomas says it could be the best thing ever. (00:07:35)

Continuity mistake: When Claire and Charlie are eating the peanut butter, Claire's hair is either over her left eye or tucked behind her ear depending on the shot. (00:38:25)

Continuity mistake: When Sawyer is tied to the tree, his hair is constantly changing positions between shots. Most noticeable is the wet hair stuck to his forehead. (00:23:00)

Continuity mistake: When Charlie is talking to Claire at the start and he says about there being a doctor at the caves, Claire has her hands on her baby bump. Camera changes and one hand is raised and the other is holding a bottle of water. (00:05:40)

House of the Rising Sun - S1-E6
Continuity mistake: When Michael is ranting at Jin, his grip on the axe changes between instant cuts. (00:34:45)

House of the Rising Sun - S1-E6
Continuity mistake: When Sayid walks over to Michael, Michael has his suitcase open and a blue shirt and some white items visible in it. When Michael throws the shirt from his hands down behind him, the remaining white items have vanished. (00:26:20)

House of the Rising Sun - S1-E6
Continuity mistake: When Sayid returns to the beach after Jack mentions moving to the caves, he picks up his axe blade down. When he walks off it's blade up. (00:25:45)

House of the Rising Sun - S1-E6
Continuity mistake: When Michael is explaining what happened, the position of the cuffs on Jin keeps changing from by his watch to halfway up his forearm. (00:08:50)
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.
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