Revealing mistakes: On top of the ruins there is an opening with a rope in which people can lower others by turning a wheel. When one of the characters is going down into the ruins, the camera changes quickly between the person going down into the ruins and the characters lowering the rope. Even though they are lowering a person into the ruins, they are actually twisting the wheel the wrong way, which shows the rope moving up, as if they are taking someone out of the ruins.
Revealing mistakes: The rope for the descent into the ruins changes lengths.
Factual errors: While on top of the ruins, a bottle containing an amber colored liquid is shown several times. At one or two points the label is visible, saying "Blanco tequila." Blanco (white) tequila is completely colorless.