My favorite bit about the early episodes: John Robinson with the Bell X-1 rocketpack! Oh, how cool was that? It's especially fun if you are an FX geek like me, and watch for the cuts betwwen the real rocketpack shots on location, the Lydecker miniature and the shots done with him (and sometimes him and Penny) on a crane.
The music for those sequences was taken from a Bernard Hermann score to another Fox movie... "Beneath 12 Mile Reef"
In fact, if you watch the original pilot, without Dr. Smith and the robot, you'll hear a lot of Bernard Hermann tracks: Mostly from The Day the Earth Stood Still, but also a few from Beneath 12 Mile Reef and a couple from Journey to the center of the Earth.
Number Two: Conform, Number Six! Conform!
Number Six: I will not be stamped, filed, indexed, briefed, debriefed, or numbered! I am a person.