Strokes

Since wanting to start over again, I have questions. While watching the Olypmics it looked like when they did a flip turn during freestlye they a couple dolphin kicks after pushing off the wall until they reached the surface. And I think I remember see them do this when they dove in at the start. I know rules ect.. have change so I thought I would ask. Plus, if I did see this correctly - why?? It must cut some time or they wouldn't do it. I have also read, that since my day they have changed the backstroke turn. If I read it correctly, I understand it to be while coming into the wall you can turn over to you stomach, do a flip turn ( like normal) but come out on you back, instead of turning over to your stomach. Do I have this correct??