I just love the way Christopher Hawkins starts that dance, he's almost winding himself and his partner Joanne up before they go!
The thing you notice when watching a professional couple dance ballroom and then compare it to the celebs - male in particular - is that there is so little "sway" in their movement. That is the way the body inclines as they move across the floor. The male celebs just keep their shoulders totally level the whole time. It's such a shame as it means they don't flow and drive across the floor as well as they could, but the pros don't have time to teach it.
My teacher always says she wishes for the first couple of weeks on SCD they were restricted to basic steps only so that they can learn the technique better. As you can see from that video, basic doesn't equal boring!