Looks like a guy was filming Mulholland Drive, found a cop sitting there, and thought this would be fun since it's a known bikerdouchebag spot.
Another famous bikerdouchebag spot is US 129 in East TN. People crash there. Often. And it's usually under 25 year olds on crotch rockets. The old timers on Harleys usually never end up in the obituary - at least not from that road.
Considering that the one person I know who is a both an owner and tremendous enthusiast of this style of motorcycle is also a porn actress, I find it magnificently appropriate.
My mother lives about 5 minutes or less from US 129, "the Dragon." It's a really fun road to drive on, but it is truly filled to the brim with Harley assholes.