Continuity mistake: When Phones is playing checkers, there are four white pieces on the board. In the next shot, there are three, and in the shot after that, there are now four again.
Stingray (1964)
1 continuity mistake in An Echo Of Danger
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.