Frame 48-53 chariot brushes against boulder and moves it.

This episode stars Royal Dano, who had yeaers earlier portrayed Simon Peter in "King of Kings."

Not to be overly critical to the critcs that is, sorry, but just an observation. Lost in Space happens to be the most down to earth no-nonsense drama and quality acting. Given the era this was portrayed and lack of technology special effects with computer graphics, traditional concepts of family values of the 60s, Lost in Space faired superbly. There will always be flaws or filming errors in general, as I myself have noticed too in Lost in Space, and no director or film shooting expert is not perfect., But the errors in Lost in Space pales in comparison to the proportionately bloated preverted modern prime time programs we see today. Whats more, is there is deep, genuine, realism in the emotion and dialogues of the actors.