When Shannon is talking to Locke in the jungle, there's a bloodstain on the left of his face. Between shots it changes from running horizontal to vertical on his face.
When Jin is washing the blood off his hands, there's a large blood stain on the shirt on his right elbow. In the next shot, the stain has disappeared.
When Locke is talking to Michael on the beach, they show Jack behind Michael and his tattoo is on his right arm. It is supposed to be on his left arm.
When Hurley talks to Jin on the golf course, a house can be seen in the left corner of the background.
At the end, when Charlie is on the beach talking to Claire, there's a navigation buoy visible in the sea.