The most exciting thing that happened was that the leader may have winked at the camera man. It was exciting enough that it led to 20 minutes of commentary, speculations about his state of mind, and what the significance of the (possible) wink might really have been. The only other "excitement" of the day was when one of the riders rose from the saddle for 17 seconds and began to pedal a little harder, then stopped, when it became clear he wasn't gong to pass anyone. Compared with the rest of the race, it was riveting, and again, gave the commentators something to talk about for the next half hour.
I understand that competitive bicycling at this level is very hard, and the athletes are extremely fit, but it is a sport that is completely uninteresting to watch, to the point that I found myself craning my neck to try to watch the daytime talk show two screens over. Even without being able to read the closed captioning, the talk show was a lot more fun.