It's interesting seeing how they dealt with moving objects like the boats.

If you scan anti-clockwise until the river is hidden behind the buildings you should see two tour boats with "China Bohai Bank" on the side. One appears to be pulling in and one pull out. If you look at the passengers - it's actually the same boat. If you follow the river clockwise, you'll see two barges carrying dark material. Again, these are the same boat.

I could be mistaken, but it seems in both cases that some 'manual effort' would have been involved to make the picture look natural by placing the duplicates slightly out of position as if they were two individual boats.