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 mistake in An Echo Of Danger
Starring: Lois Maxwell, Ray Barrett, Robert Easton, Don Mason
Trivia: Gerry Anderson based the facial features of Captain Troy Tempest on the American actor James Garner.