At 44 minutes, as Max wades in the stream his trousers are soaked up to his knees. They are completely dry a few minutes later when he is in the Fielding home.
As the volcano erupts during the credits, the same shot of sparks flying into the air are shown ten times, including after Arturo Dominici climbs over the rocks.
The diver walks ankle-deep into and out of the sacrificial pool, several feet away from the edge. When he submerges, he's suddenly in very deep water, with no sign of a shallow underwater shelf.
About 6 minutes into the movie, when the scientists are walking back to the grotto, their torch flames disappear as they pass the background matte screen.
As Prof. Fielding walks to the pool, a few rocks are thrown into the water from off-camera.
As Arturo Dominici enters the jungle, he walks past the camera and casts a shadow on the background matte screen.
Sometimes Max's face and hand look normal instead of scarred and bony.
At 24 minutes, a sign with the English words "DANGER / GASOLINE" is visible. A few seconds later, the hero gets in a truck with right-hand drive. The film is set in Mexico, where Spanish and left-hand drive are the norm.
When the radio antennas and the radio operator are shown, a Norwegian flag is in the background.
When the police car drives up to Prof. Fielding's home, the car hits a motorcycle.
At 28 minutes, Professor Fielding tells his wife that no one is to enter his lab. When she enters ten seconds later, he does not rebuff her.
At 41 minutes, as the police photographer takes photos of the nurse victim, he points the flash at the movie camera rather than illuminating the victim.
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