Through The Looking Glass (2) - S3-E23
Factual error: When Charlie is in the small communications room of the underwater base, after the grenade blows out the window and the water is rushing in. The water would only come up to the top of the window, anything above that would be an air pocket and water would not go any higher, yet it got completely filled over Charlie's head. (00:30:00)
Visible crew/equipment: When Hurley is at the new house, after his mom hurts her ankle, he reaches into the car window to get the cell phone. When he begins to dial, the cameraman's arm moving about is reflected in the back chrome of the side view mirror. (00:12:10)
Tabula Rasa - S1-E3
Locke: Do you play checkers with your Pop?
Walt: No. I live in Australia with My Mom. She got sick, she died a couple of weeks ago.
Locke: You're having a bad month.
Answer: He was eating a peice of an orange with the skin still on.
XIII