Corrected entry: Given they seem to be so close (it takes him less than two days to get home) and so aggressive, it seems unlikely that Jaguar Paw's people have no knowledge of the existence of the Mayan city. Maya settlements at that time were widespread, with communities scattered widely around a political center.
Corrected entry: Heads and bodies rolling down a flight of stairs would disperse, causing a triangular stain on the steps. The film has an inverted triangle. I assume the flight of steps is level.
Corrected entry: When the prisoners are being led through the city, there is a shot of a horse's skull on a vendor's stand. Horses were not native to the Americas, but were introduced by the Spaniards.
Corrected entry: When Jaguar Paw runs through the corn field on the way to the jungle, he falls into the ravine filled with dead bodies. While he is surveying the carnage a red flash appears on screen. Upon stepping to this frame it shows a man lying amongst the bodies wearing blue jeans, a red and white striped shirt and hat, and holding a similarly striped umbrella.
Corrected entry: In various close-ups of the male Indians' faces, you will see tiny but thick hairs "growing back again" in the mustache-part of the face like after-some-time shaved. In real life, American Indians couldn't grow beards or mustaches; it was a genetical condition of their race.
Corrected entry: When the woman gives birth in the watery pit, the baby is quite big compared to how small the woman's belly was before the birth.
Corrected entry: Even though the entire tribe was taken captive at the beginning of the film, when Jaguar Paw returns home he is able to kill the bad guy using the trap that killed the wild boar in the beginning. In the interest of safely, it is unlikely that such a dangerous trap would be left set all the time, and the men of the tribe were not out hunting at the time of their capture. Further, it is doubtful that one man would be able to set such a trap by himself, especially in the amount of time shown, so it is unlikely that Jaguar Paw found the trap sprung and set it up all by himself.
Corrected entry: The journey of captured people and the war party, brings them on the right side of a river (looking downstream), and they proceed crossing it from right to left. Later, on his journey back home, Jaguar Paw jumps into a waterfall and swims out on the opposite bank again crossing this river from right to left, and yet soon we learn that he is back in his neck of the woods, despite the fact that he crossed two rivers.
Corrected entry: When the jaguar is killed, the head of the dead animal is on top of the body of the Mayan warrior it had previously mangled. In the following wide shot the animal is several meters away from its prey.
Corrected entry: When they are sacrificing the captives, they tear out the beating heart of the person. They then hold it up, and the person watches in horror as his own heart is beating. If you ripped out a beating heart, the person's blood pressure would drop to zero right away, and they would black out.