Continuity mistake: When John is playing chess, we see him make a move, followed by the computer making a move. It's now John's move, but when he makes his move, all the pieces are in different positions. The screen is in shot all the time, and we don't see him make another move explaining the moved pieces. (00:28:00)
Visible crew/equipment: When John looks through the binoculars at the start, it reflects 2 big white squares which, considering they are in the jungle looking at a blue/rust coloured building, it appears to be part of the filming equipment. Perhaps a light screen? (00:06:20)
Answer: He was eating a peice of an orange with the skin still on.
XIII