Video of pros going through transitions, or water stops

Did you watch the live coverage?  They didn't show a ton of it but I definitely remember seeing T1 and T2. 

Are you referring to IM/140.6 distance races? Those transitions are in a closed tented area (male and female separate) so people can do full changes - no cameras

A great way to see this and observe the good, bad and ugly is to volunteer in T1 or T2 change tents during a race. 

If you want to see fast T1 and T2 from the pros, find some videos of the ITU/Olympic races.  

It would be nice to see how the pros do it at any distance.   When I first got into this sport I found a DVD on transitions and it was really helpful.  I've pretty much put all of what is taught to use.   Maybe worth looking into.   I found it here:  http://www.amazon.com/Triathlon-Transitions-Mastering-4th-Discipline/dp/1935045091

https://www.youtube.com/watch?v=a3HrO9eHlFU

Start at the 50 second mark and then again at 1:45.  Don't blink!

Rev3 used to include some transitions in their highlight and various race videos. Don't know if they're still hosting all those on the site though.

T1, yes, basically none will use socks for the bike. Ride out with feet on shoes, or a few may slip feet in as the jump on. I *think* more tend to do the former. They'll get up to speed and then slip in & buckle down. It may be a mile down the road before they do this. You'll see some idiot age groupers try to do this immediately and clog everything up.

T2, yes, quick pull laces of some type are very common. Short course goes no socks. They have the shoes and training in for that. Long course may see some sock use. Becomes more individual with longer distances.

Bottle refills are at the aid stations. Some will just switch out the bottle at every aid station. Maybe 2 if they're really good and need it. Pros have WAY more space than age groupers do. Some have a type of storage tank with straw. These tend to have a quick access port on them made for fast & easy refills. Ideally they would dump the bottle in quickly and chuck it, but they might need to hold it to the next aid station if not fast enough. Littering is bad and is a penalty. An age grouper is probably best planning to hold the bottle and chuck it later. Aid stations are tricky with a lot of things going on, so get the bottle, get through the station, then refill.