Visible crew/equipment: As they notice something large pass through the woods, the camera pans from left to right You can see a blinking light to the right of the waterfall in the distance on the lake, which is something in the park in New Zealand. (00:36:50 - 00:37:30)
Suggested correction: The flashing light actually belongs to the rotating beacon light on top of the shuttle. This light is shortly after when the crew start to return before it explodes.