Some parts of Olympic spectacle were faked

Some parts of the spectacular Beijing Olympics opening ceremony on Friday were faked. As the ceremony got under way, viewers watching at home and even on giant screens inside the National Stadium were treated with, in parts, computer graphics.
The fireworks were there for real, outside the stadium. But those responsible for filming the extravaganza decided in advance that it would be impossible to capture all 29 footprints from the air. So they resorted to trick photography.