Chuck, he asked you to explain, not copy and paste.
I'll attempt to address some of it. I'll defer to Chuck to check behind me, since he's actually officiated these rules.
The NBA rule allows for a pivot in situations where the NFHS rule does not. It's associated more with where the feet are, as opposed to whether the land simultaneously or not.
It's not traveling to fall to the floor with the ball. It is traveling to catch your own airball.
Many of the other restrictions are the same. Lifting the pivot when starting a dribble is no different than the NFHS as I read it. This is probably the call that is not made the most often.
I have great respect for NBA officials. But they still ignore a lot of traveling, IMHO. I don't think I'm alone in that thinking.