The stuntman riding the motorcycle as George is noticeably thinner than the actor playing George.
The opening scene established that George parks his motorcycle in plain view of the front of the building. Diana changes into Wonder Woman in front of the building as George mounts his motorcycle and he would have seen Diana transform--she made no effort to hide during her transformation.
Wonder Woman is chasing George on the motorcycle and jumps the bike over the van in the intersection. You can clearly see the position of the jump ramp underneath the van.