This episode seems to be the start of Smith's descent from cold, calculating villain to comic coward.
After surviving the raging sea and finding dry land once again, the Robinsons and Don dismount the chariot. John, with his presumed Bible, wants everyone to pause and "give thanks" for their survival. Everyone, except Don, gets on his knees.
The scene where the Robinsons give thanks was recycled from the original pilot, although there it was the cliffhanger ending. In that one, as they are shown giving thanks, a gradually receding wide shot shows that the Robinsons are being watched by aliens and leaving it up to the viewer to wonder if something will happen to the Robinsons. Those aliens were reused in Invaders from the Fifth Dimension (1965).
The shot of Smith looking out the window and turning to say "Robinson alive? Impossible!" is recycled from Island in the Sky (1965), when the chariot was returning from rescuing Robinson after he made a single person descent to the planet.
As of 2016, actual scientific data shows what happens to the Robinsons on this episode is not far off from fact, albeit with caveats; there have been planets detected which circle precariously close to their star in locked orbits. This means one side always faces the star, whilst the other side is in perpetual darkness. This means one side is blasted with temperatures in excess of more than 350°, as the far side is continually frozen. This means that there's a constant jet-stream which whips around the planet at incredibly high speeds, thousands of miles per hour. If any life were to exist, it would only be in a very thin line, approximately at the dividing lines of the 'hot', and 'cold' sides. One other problem; any atmosphere the planet would have would be blasted away by the un-ending particle bombardment from the star. The atmosphere would be constantly ripped away, and any observer would see this lost world with a long tail, that being its lost atmosphere.