Jack Lord is Felix... Unlike the characters who remained until death or retirement (Benard Lee, Lois Maxwell, Desmond Llewelyn), Felix has been played by several actors. However, the best Felix is at the time future "Hawaii Five-O" star Jack Lord. He plays the most realistic CIA agent compared to the hacks that followed. I'll admit that David Hedison (who played Felix in Live and Let Die, and License to Kill) is ok, but they really missed an opportunity to build the character with Lord. He and Connery were on equal ground, where you don't get that feel with Felix in "Goldfinger", "Thunderball", and "Diamonds...".
Enough about one character. This movie spawned the rest, it was a such a hit that we're now on our nineteenth official Bond film. It's not my personal favorite, but to only dream that the current crew could revert to a movie of this type. It was followed by the hard to top "From Russia With Love", which along with "Goldfinger" and "OHMSS" are my favorites.