I have not been an avid watcher of the Olympics (I don't own a television anyway), but I saw some of it in a pub.
One thing that surprised me was that the swimmers came onto the poolside wearing tracksuits and sneakers. There were also a lot of sports officials on the poolside wearing shoes.
At every swimming pool I have been to, you are required to take off your shoes and socks and use the footbath before entering the poolside. I imagine the reason the swimmers come dressed and shod onto the poolside is because they need to keep warm. But do the sports officials and attendants not need to use a footbath?