The below always move
Flags move
Banners move
Windmills move
Turn arrow thingys move (at SSR11 & TR246)
Crowd
Ferris wheel
Billboards (Grand Valley, Apricot Hill, Laguna Seca)
Gran Turismo signs on SSR5 & SSR11
Camera Flashes
Wind (even though you can't see it)
The following things move with your help
Windscreen Wipers (as you said, on the 787B)
Arials
Mudflaps
Dust clouds
Cones
Tire smoke (sort of)
Shadows
Car
Brake markers
Spray from the back of your car (SSR5Wet only)
And these don't move at all
Monkey
Blimp
Clouds
Sun
People standing in the garages in pit-lane