The streetview car hit this tree branch, tore it off the tree, and then carried it around in front of the camera for much of their route. You can follow the driver’s route for miles around town with this branch still attached to the camera assembly, partially obscuring the view. (thanks Jordan)
Funny thing is, I posted an image of the same thing back in May. Thanks for finding out the source.
https://www.streetviewfun.com/2013/google-plant-view/