Revealing mistake: At the very beginning of the episode, we see a hydrocharge being fired which causes an explosion in the sea. Then just a few shots later, another hydrocharge is fired and we see the same explosion - this is due to footage of one explosion being used twice.
Stingray (1964)
1 revealing mistake in The Ghost Of The Sea
Starring: Lois Maxwell, Ray Barrett, Robert Easton, Don Mason
Visible crew/equipment: When Phones is unravelling the secret plans, a hand can be seen pulling him back to help unravel the plans.