It was, and is, a priceless memory. Barbara Eden was just like you'd expect; kind and sweet. What a special lady! I remember George Kennedy being somewhat intense as he was rehearsing his lines in between scene shots off to the side of the set. Other people in the cast included Joe Namath (he wore his Super Bowl ring and even took the time to throw a few footballs to some members of the corps), Melissa Sue Anderson (Little House on the Prairie - absolutely beautiful, but not nearly as kind and sweet as Barbara Eden), the Double-mint twins, and a number of other actors/actresses you'd recognize, but I don't recall their names.
I also remember LOTS of food on the set for breakfast and lunch (We had to wait for the "real" cast members to eat first before we got to swoop in and feast away with whatever was left). Being in the presence of Nelson Riddle was totally cool. What a great memory. And working with a Grammy winner (Frank) was a treat.
As for payment, we all received a small amount of money for our services, but nothing too elaborate. I don't know what the corps received (if anything). But Frank said it best; it was a priceless memory we can all take through our lives.