Goofs

Two of the team get trapped then rescued from quicksand. In subsequent scenes, before they find water to wash with, their clothes are fairly clean.

At about 1.18.15 when the doctor is about to be sacrificed he's on his knees with his wrists bound, seconds later he escapes and his wrists are free.

During the archaeological dig, a worker finds a mining pan and brings it to Susan Jordan, who tells him it is only recent evidence of coal mining, not an ancient artifact. Coal miners don't use pans, gold miners do.

When the party member has his head cut in half there is no blood.

Set in the Grand Canyon, this is clearly not so arid an environment.

Man attempts to open a large stone door with running shoulder shoves.

When they are shot at by the man with a rifle, there are no casings coming out or magazine in the gun.

The Aztecs are wearing plastic flip-flops. In fact, it is not possible to tell what material the sandals are made of. From their on-screen appearance, they could easily be leather.

After they are abandoned by their guides, the group continues. Soon, one of the horses can't go on, falls and dies. But its eyes are still flickering, and its nostrils are still flaring. The horse has collapsed and is unable to continue but it would not have died instantly.

The "Aztecs" in the valley are, for the most part, not native Americans. There is little to indicate the ethnicity of the actor playing the Aztec and most, if not all, look at least faintly Mexican.

The "quicksand pit", is a very neat rectangular, it has sharply vertical edges which show tool marks.

In an early scene, two Aztecs are running down a path. The smooth, bare ground with plants along the middle shows that it has clearly been worn by modern vehicles with large tyres.

In the Aztec treasure chamber, there is a (relatively) modern hurricane lamp.

"... we're the first persons to discover this cave in hundreds of years ..." says Dr. Thain but they are standing next to one of many burning torches which the group did not light.