Very interesting footage. Thanks for posting it, it's a shame the audio is missing.
My take:
Part of the video is casual (the parts of Rutherford drinking, apparently a little loopy, clowning around). Other parts appear more staged, and even professional enough to have been intended as a propoganda film (bounteous harvest, waving flowers, Rutherford working the fields like a 19th century farmer) Even in 1939 many farmers were using tractors, and they obviously had trucks, bulldozers, etc at the building of Beth Sarim. The footage of him farming must be staged for some reason; I really doubt he ever did farming like that in real life. So I would conclude that the original (for that portion of the video) was accompanied by narration with the typical WT jargon about the Earth's harvest in New World, etc. Nevertheless, an invaluable contribution to our perception of Rutherford the man.... Thanks.