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)