Whatever the Case May Be - S1-E12
Continuity mistake: When Kate and Sawyer find the deceased crash victims underwater, as Sawyer takes the man's wallet and heads for the surface the corpse's tie floats up freely, his suit jacket is pulled way up, and his legs are spread apart. Yet, when Sawyer and Kate go back for the case, the neat tie and suit are on properly, and now the corpse's legs are suddenly crossed, albeit in a twisted sort of way. There are other changes in both the female and male corpses' positions between shots. (00:05:20 - 00:05:50)