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 - chronological order
Starring: Lois Maxwell, Ray Barrett, Robert Easton, Don Mason
Emergency Marineville - S1-E11
Continuity mistake: When the second group of Spearhead jets take off from Marineville there are only two jets, but in the next shot you can see three jets, and in the next shot there are two again.