Count Down - S1-E9
Character mistake: Everyone refers to the Professor as "Sanders", as does the poster at the main gate, but X20's letter is addressed to Professor Saunders.
Stingray (1964)
1 character mistake in Count Down
Starring: Lois Maxwell, Ray Barrett, Robert Easton, Don Mason
Audio problem: When the 1st WSP Commander is speaking in Washington D.C. he is voiced by Don Mason, but when he speaks to Commander Shore at W.A.S.P., he has a completely different voice provided by Ray Barrett.
Trivia: Gerry Anderson based the facial features of Captain Troy Tempest on the American actor James Garner.