NBC promotes its "Sunday Night Extra" which provides different camera angles, stats, etc.
I decided to check it out.
The concept was great, kind of like Fan Vision for home use. Except. It wouldn't come up for the longest time. It said "starting" for much of the first quarter, then it came up. It was maybe 5 minutes of real time behind the TV broadcast. And throughout the evening, it kept buffering and falling farther behind. As the Jets scored early in the 4th quarter, the broadcast hadn't reached halftime.
It was very odd, indeed.