Check out these superlatives: more than 15,000 performers. 4 hours long. Reportedly cost over USD300 million to produce. Attended by more than 100 heads of state, heads of government and sovereigns, by far the largest in Olympic history.
An NBC commentator said: “No matter how spectacular others have been, and there have been many, that this is uber-spectacular. Even if they pull off 75% of their plans, it will truly be over the top and it should be something that that anybody who sees it will never forget.”
Well, no matter how good it is, people will remember the fakes and the failures, which include the following.
On 11th August, 3 days after the opening ceremony, it was mentioned in Gizmodo that what must be the world’s most spectacular display of Microsoft Windows XP Blue Screen of Death ever seen was right there on the roof of the Bird’s Nest:

This photo was first posted at powerapple.com. The date is 9th August instead of 8th August because by the time the torch was lit by Li Ning, it was near or after midnight in Beijing.
Rivercool was inside the stadium during the ceremony and reported that the BSOD was there for about 2 hours, from 10pm to midnight local time. Why the technicians didn’t notice it is anybody’s guess. An even more pertinent question is: what was the purpose of the roof projection?
Bill Gates was at Beijing too for the Olympics. Wonder what he thought of this.
Then, on 12th August, 4 days after the opening ceremony, Lin Miaoke, 9, who sang “Ode to the Motherland” that night was revealed to have only been miming, and that it was not even her voice, but rather that of Yang Peiyi, who was not chosen because she wasn’t pretty enough, even though her voice was better than Lin’s. Apparently it’s something to do with her crooked teeth, rather than a need for acne cream. This decision was defended by the organisers as “it was in the best interests of the country.” As for Yang, she was reported to have said that she did not regret the decision, as “she was satisfied to have had her voice featured in the opening ceremony.”
This was the performance:
Before that episode, on the 10th of August, it was revealed that a fireworks display used during the opening ceremony was a digitally-crafted fake a year in the making which was then inserted into live TV feed at the correct moments. Those watching TV would’ve seen 29 (or was it 28?) firework “footprints” travelling across Beijing from south to north. Later a senior official from the organising committee confirmed that footage of the display had been produced before the actual opening ceremony. It was explained that this was done for “convenience and theatrical effects,” because following the footprints’ real trail would’ve been too dangerous for a helicopter camera:

It must be said that the footprints were well and truly set off, which can be clearly seen from the ground:
Source
The BBC, 12th August 2008
Gizmodo