Could just be moisture on the camera lens. Or on the car window. But then again, I look at the pics on my phone and maybe can't see what you guys are seeing on larger screens.
I'll say this, though. Regardless of what MPD says, the chances of the Altima not being related at all have to be low. As you have pointed out, SWFA in the video comments stated that a car in their parking lot at that time of night was very unusual. And then obviously A very unusual murder occurred a few hours later at a neighboring structure.
So these two very unusual events occurred the same night, two hours apart, and are not at all related? Come on.