My NBC affiliate didn't ever show the end of the opening ceremonies. I waited for it - I even watched that horrid Animal Hospital (I say that and I like Justin Kirk!). I stayed up to watch the repeat of it, hoping to see The Who and the dancers from the Royal Ballet, thinking I was just not paying attention when I watched earlier. They never showed them - they just cut and went to an infomercial. Not cool.
As much as I love Tom Brokaw, the time to air his special about WWII was not on the last night of the Olympics. That should have been during a daytime broadcast or another evening. SO many people were tweeting about, including Mia Farrow, who said something about turning on NBC and not seeing Olympics at 8:15PM. If they had aired that special at another time, there would have been enough time to show the entire closing ceremony.