Plot hole: The opera house is directly above the Phantom's hideout in the sewers, with an orchestra booming loudly overhead almost every night (the Phantom plainly hears the orchestra), but this constant vibration doesn't affect the integrity of the subterranean structure. But at the end, the noise of two simple gunshots causes the Phantom's hideout and a massive part of the sewer system to collapse.
Best movie plot holes of 1943
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