Continuity mistake: The controls used to make Dr. Quest's VTOL aircraft take off and land vertically change each episode the VTOL is in.
Jonny Quest (1964)
1 continuity mistake in show generally
Starring: Tim Matheson, Don Messick, Danny Bravo, Mike Road
Continuity mistake: Race secretly snaps a picture of his double, but later in the episode the developed picture shows Race's double and the big henchman standing side-by-side, as if they posed for the picture.
The House of Seven Gargoyles - S1-E23
Jonny Quest: We have a proverb in my country, Hadji - seeing is believing.
Hadji: We have one in mine, too - I'm from Missouri.
Trivia: "Calcutta Adventure" is the episode where Hadji and Jonny meet and become friends after Hadji saves Dr. Quest's life from an assassination attempt.