Before becoming lost, the Jupiter 2 would have reached Alpha Centauri, a distance of approximately 4 light years, in about 5 years. However, the spaceship was written off by Alpha Control and declared beyond the limits of the Milky Way, but the closest edge of our galaxy is 25,000 light years showing this to be impossible.
Dr. Smith states he has won three GM (Grandmaster) titles at the Oxford University Chess Society. In fact this goes against the actual rules of the world chess organization FIDE (World Chess Federation) that state a chess title is won for life.
In this episode, the first of the regular series, it's heard that the Robinson's voyage has taken five years so far. This differs from the 98 years that had been stated in the unaired original pilot.
Dr. Smith holds the rank of Colonel.
Narrator: This is the beginning. This is the day. You are watching the unfolding of one of history's great adventures. Man's colonization of space. Beyond the stars.
Narrator: Here now is the Jupiter 2. The culmination of nearly 40 years of intensive research and the most sophisticated piece of hardware yet devised by the mind of Man. Bold in concept, brilliant in execution, this most delicate yet most colossal of instruments makes possible Man's thrust into deep space, and will soon set out on its quest for a new world. This super spaceship stands two stories high. The upper level contains a fantastic sophisticated guidance control system. An electronic elevator connects both floors of the intergalactic vehicle. The upper and lower levels are operationally self-contained. Here on the lower deck, pulsating with unbelievable force, are the great atomic motors that will power the ship to new world.
Dr. Smith: Send us back to Earth. Every second you waste sends us thousands of miles in the wrong direction. What are you doing?
Don: Waking up the Robinsons.
Dr. Smith: No, don't wake them.
Don: Why not? It's their lives too, and since I'm the only one who can pilot this ship, I'll make the decisions.
Dr. Smith: Have it your way, then. Make it a family outing. Why not?
Maureen: (surprised to discover that Dr. Smith is aboard the Jupiter 2) Why, Dr. Smith, you shouldn't be here at all!
Dr. Smith: Precisely the point I'm trying to make, Madam. Without much success, I might add.
Dr. Smith: (speaking to Will about the Major) Well, that's the military mind for you. Kill or be killed. That's all they understand.
Maureen: Now I say we turn back. Don't you have an opinion?
John: No, I don't. Not until we've checked every component inside-out and know exactly how we stand.
Maureen: And then?
John: And then I'll let the computer make the final decision.
Maureen: And will the computer also take into consideration a man's love and concern for his family? Or has all that been put into cold storage for the duration?
This is the first episode with the familiar theme song and opening sequence from the first two seasons (the unaired pilot had no theme music). This theme was composed by John Williams, famous composer for such movies as the Star Wars and Indiana Jones movies.