Revealing mistake: When Anguirus makes his sacrificial charge against Gigan, the hand that is moving the Anguirus costume can be seen holding it.
Revealing mistake: In the opening scene, when the soldiers and slaves march down the mountain, as the carriage containing Aguirre's daughter passes by the camera, one of the soldier extras just behind the carriage looks directly at the camera. (00:03:38)
Revealing mistake: Just before Louise shoots him, Andrew turns to face the camera, and the blood packs under his shirt are very visibly outlined.
Revealing mistake: During the iconic dojo brawl scene, Bruce Lee at one point picks up two men and whirls them around. It's obvious in the wide shot that they are just dummies.
Revealing mistake: When Shaft fights the bad guys disguised as flower delivery men, both die with their blood packs that explode triggered by visible pyrotechnics - kinda odd to shoot a guy and see literally flames burst out from his chest or back before any blood comes out. (00:48:50)
Revealing mistake: When Stewart's wrestling with the alligator look closely and you can see the black strap keeping its jaw shut.