In the chapel, Ben blows out and puts down the same match twice.
The amount of water in Sayid's glass changes.
When Sayid is being treated in the hospital, Jack's shirt goes back and forth from soaked with sweat to being clean.
On the front of the SUV that Hurley's driving when pulled over by Ana-Lucia, there is black tape obscuring the Chevrolet emblem, but when he's leaving the gas station later, the tape is gone.
During Hurley's police stop, the first exterior shot of the street behind the vehicles shows a straight 4-lane road with traffic lights. The street reflected in Hurley's mirror during the stop and the exterior shot after Ana-Lucia leaves shows a curving 2-lane road without traffic lights.
When Sayid wakes up in the hospital and attacks Jack, the beeps from the ECG monitoring his heart rhythm never speed up, even though he went from a comatose state to a fighting state.
When Hurley's mother is opening a bottle with a bottle opener, no sound is heard. It is already open but she is only holding on the cap until the camera view comes in focus and she acts like she is opening the bottle.
When Hurley is pulled over by the "police" in California, a sign for Windward Auto Spa located in Kaneohe, Hawaii can be seen in the background.