Continuity mistake: At the motel, when Kate asks for the envelope addressed to Joan Hart, the employee searches through the box with many envelopes sticking out of the box. However, in the next shot, as he finds it no other envelopes are visible, and when he hands it to her, her sunglasses are now upside down.
Add timeSuper Grover
Continuity mistake: When Tom removes the toy airplane from the lunchbox, the three propeller pieces are completely broken off of the left wing engine (all are intact on its right wing). Yet, earlier on the island, when Kate twirls the airplane in the air, before Charlie joins her, the left wing engine has grown one piece of propeller that is unbroken. There are other moments such as this, in other episodes.
Continuity mistake: When Kate burns Joanna's passport photo in the close-up the corner of the book burns up, yet in the wider shot the corner does not burn, and in the next shot another change, including the lighter. Later, when Sawyer holds up the passport, the burned page edge is just a bit singed.