Other: At the beginning of the film a bomber is crashing. As this is happening another bomber is stationary in the sky.
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Mistakes
When Miller throws explosive into the German patrol boat's engine room it explodes in sheets of flame, etc. However, there is no damage at all to the fishing boat - no scorch marks and no debris. At least the sail should have caught fire. See more...
Guns of Navarone mistakes
Other: When Miller throws explosive into the German patrol boat's engine room it explodes in sheets of flame, etc. However, there is no damage at all to the fishing boat - no scorch marks and no debris. At least the sail should have caught fire.
Continuity: In the scene where the group is climbing the cliff, even when Mallory and Stavros reach the summit and kill the German soldier, there is hard rain. However, in the next shot when they throw the German soldier by the cliff, there is no rain and the sky is clear.
Guns of Navarone trivia
Anthony Quinn was so taken with Rhodes, the location for the movie, that he decided to buy some land there. Particularly a bay formerly known as Vagies Bay, which is still called Anthony Quinn Bay.