The common belief that Guy Williams and June Lockhart were written out of this episode for laughing during "The Great Vegetable Rebellion" is actually false. Bill Mumy confirmed that it was just never in their contracts to appear in all episodes.
Actress Dee Hartford returns to play Nancy Pi Squared. Hartford had played the android Verda, in the 2 previous episodes The Android Machine (1966) and Revolt of the Androids (1967).
The snow in the final scene was made of hot plastic, which burned Marta Kristen's eyes and made her go to the infirmary after shooting.