At different times during NBC's Olympic coverage, they will advertise that people should go to www.nbcolympics.com to check out the coverage schedule. Do not go to this site if you are actually intending to watch the coverage later.
Today, I logged on to the site. There is indeed a link to see the primetime coverage schedule, but right next to that link is a colorful and changing display that announces the results of events that have already occurred but will only be shown later that night. I accidentally learned the results of the women's all-around gymnastics three hours before NBC's coverage began. I realize that these things will leak out from time to time when the host country is 8 hours ahead of eastern standard time. However, I would not have thought that NBC's own coverage website would be one of those places where the cat gets let out of the bag.