I liked the ad when I first saw it, and I still think it clever. But I don't think that it work nearly as well if the bear: a) entered the camera and then stopped moving and b) was a color other than the colors worn by the two teams. The bear is aided in blending in by being a dark colored moving figure in a field half full of dark colored moving figures. Try pausing the video while the bear is on screen, and even in still frame he doesn't stand out that much.
I think that two lessons can be taken from the video. Drivers need to broaden their focus to include objects beyond other motorized traffic, and cyclists would benefit from attempting to stand out from their environment.