The German computer news website Heise just wrote that the footprints to the stadium made by 20 fireworks in a row have been a computer animation made in the year before the opening by a chinese video production company. One of the employees told this to local newspapers. Yes, I think that could end in problems for him.
At least what you have seen in TV was partly manipulated. At youtube you could see that there have been also some real fireworks of the footprints

http://www.heise.de/newsticker/Olympische-Illusion-TV-Bilder-der-Eroeffnungsfeier-waren-teilweise-manipuliert–/meldung/114067/from/rss09