Selfridge: This is why we're here; because this little gray rock sells for twenty million a kilo.
In the scene where Parker is shown playing golf on the indoor golf course in RDA, the first time he hits the ball, there are two other balls lying on the course side by side. In the next shot, two are distant apart and in the shot after that, they are in their original position.
In the final battle sequence, Neytiri has a white handprint on her chest as part of her warpaint. It has five fingers, indicating that it is Jake's hand - Avatars have five fingers while Na'vi only have four.