Trivia: At the very end of the film when Gregory Peck and David Niven are standing on the deck of the warship watching the explosions, you can see a very distinctive injury on Niven's upper lip. During the filming of the sequence where the commandos climb the cliffs he was slammed into the rock face by the water dumped on them to simulate the waves breaking over them. The resulting infection put him in hospital. He complains about the indifference of the film's producers in his book "The Moon's A Balloon."
Plot hole: The huge guns are set high up on a cliff face facing out to sea and it is obvious that they cannot be depressed to fire at a downward angle - the massive gun carriages set on rails would prevent that happening. They cannot be elevated to fire at an upward angle, too, because they fit pretty snugly in the hole cut into the cliff face to accommodate them. This means that their maximum and minimum ranges would be quite close together, covering a strip of maybe a few hundred metres either side. Given that the sea is completely open on the side of the island they are protecting, why don't the ships targeted by the guns while passing the island simply sail inside or outside of the narrow stretch of sea the guns can hit?
Corporal Miller: Sir, I've inspected this boat, and I think you ought to know that I can't swim.
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