The Greater Good (a.k.a. Sides) - S1-E21
Continuity mistake: Sayid wears a black tank top when he speaks at Boone's burial, and it has a wide shallow tear and small hole at the collar. When he walks away with Jack, who is complaining about Locke, though the style of top is identical, now the tear is narrower and deeper, and the hole is bigger. Throughout this episode the tear, on the tank top Sayid wears, alternates, and the hole even disappears. (00:08:50)