The Asian couple seemed completely random. The hard hat bird houses in this display were never used, but the ones along the fence were. Maybe they don't like the bright yellow.
The tin can men. He built many of these and they were scattered around in various areas. All of them were painted the same blue or blue and white.
He also had several of these tin can windmills.
Bikes lined the area above the fence and were also included in several of the displays along with trikes and baby buggies and strollers. In this picture there are actually seven bikes and two trikes, although you can only see bits of two of the bikes.