Aunt Gamma is portrayed by series creator Irwin Allen's wife, Sheila Allen (credited as Sheila Matthews).
The "computer tapes" used to "store" Dr. Smith, Judy and Don are actually pieces of 35mm photographic film.
The same actor that was seen earlier this season in Visit To A Hostile Planet (playing Dr. Smith's second in command back on Earth) appears again this time portraying Kraspo. Also, Sheila Allen makes her third and final appearance for her husband Irwin Allen the creator of Lost in Space.
The alien spacecraft is the same one used in "Condemned of Space" and "Two Weeks In Space".
In this episode, Penny is supposed to be 13 years old. At the time of this episode, Angela Cartwright was at least 15 years old.