"Mystery of Easter Island" (2012)

Because this is a Nova episode from PBS (that is, no commercials), the build up and hype to keep the audience wasn't needed.  This particular episode also managed to avoid both evolutionary ideas and "primitive" vs. "modern" culture competition.  It kept a nice flow of "here is what our questions were at this point; here is what we tried", "that failed; here's what we tried next", and "here was our next set of questions".  It also seemed to attempt to fairly present various theories--theories that disagreed with others presented and theories that supplemented other views with variations and additions.  I like how they kept going back to one of the oral traditions that dealt with the matter; of course, it involved the subject matter of what the whole episode was about.  The episode focused on two questions:  "How did they move the statutes (moi)?" with the theory as touched on in oral traditions of "walking" and "What was the cause or causes that lead to the decline of the population of Easter Island?"  Under an hour and nicely interesting.