Photo: Red Car Property Neighbor, August 13, 2015. The Red Car Property is often used by rogue film crews without permits. (Click on photos to enlarge.)
You can check permits or report problems with a production on location to FilmLA.
I forwarded photos immediately to the Red Car Property rep. I don't know if they have permission from the property owner.
The neighbor who passed through the site this morning, said they all appeared to be in their 20s, and there appeared to be no smoking on site.
Photo: Red Car Property Neighbor, August 13, 2015. If you look closely - on the left - they even brought park benches! Dogs were on leashes. There even appears to be an actor portraying a homeless man (the guy wearing a rug).
Worth noting: the protected native California Black Walnuts on the slope directly above the group is staging a comeback after the near inch of rain in July.