Alright. go to the very end of the movie where they are flying away from the island on the helicopter. Every time the camera is on Dr. Grant you can see the island's trees in the background, even when he's looking to the other side of the helicopter and is watching a bird fly over the ocean. And you start to see the same trees over and over again if you watch carefully. Obviously they needed to show the island for some reason, and i can't think of a reason why.