Continuity mistake: At about 2:15am, when Jack's talking to Nina about the passenger list on the plane, we see a shot of Jack in the top left, and Nina in the top right. Because it's real time they're both meant to match up - we're watching them both at the same time. In each shot we can see the back of the other's head, but while Jack is looking down and around in the left-hand shot, in the right-hand shot his head is staying perfectly still. (00:15:51)
Visible crew/equipment: As Kim runs over to her friend at the end, a camera shadow can be seen on her arm. (00:41:00)
Answer: This is unintentional and a simple continuity mistake.
Ssiscool ★