Did Anyone Else See the Goof at 16 minutes?

At around 16 minutes into the movie, when Derek (Peter Jackson) pulls the knife out of the aliens foot on the cliff, the camera pans out to show the cliff, Derek stumbling at the edge of the cliff, and the alien hanging off the cliff. Also, all the way to the left of all this, you can see a man kneeling down in the grass holding the rope so that either Jackson or the alien would not fall off the cliff. It was hilarious, and it is extremely noticeable, not missable.