Some of the footage where the chariot is stuck in the volcano eruption is reused footage where they were stuck in a meteor shower.
When Will Robinson descends down the spiral stairs into the control room with the Princess, much of the instrumentation, controls and equipment are from the Voyage to the Bottom of the Sea (1964) set (in particular, the large serrated-edged separation doors that isolate the forward viewing compartment on the "Seaview" from the rest of the submarine).
Royal Dano plays a character named Major Domo. A "majordome" is an old title for the head of a royal house's servants.
Filmed at the same time as the episode All That Glitters (1966), which explains why Maureen, Judy, Penny, and Smith are seen only at the end. Production of the series was chronically behind schedule during the first season and the simultaneous filming of the two episodes was an attempt to catch up.