Revealing mistake: At 48:28, there's a shot of a large bird on a rock in a river, a Cattle Egret, and it flies across screen and goes out of view on the left. Cattle Egrets are originally from Europe and were not present in the Americas until around 1877. (00:48:25)
Revealing mistake: Watch closely when the first two 'slaves' run for their freedom amidst flying spears. When Jaguar Paw's friend (the chunky fellow) gets speared, it is a 'through the armpit' effect. When he's gasping for breath in the next shot, the entry of the spear is actually more in the middle of his chest.
Answer: It is not specifically identified, but it appears to be the degenerative neurological disease called kuru. It is fatal and believed to have been spread in ancient sub-tropical cultures by cannibalism. Its symptoms resembles the encephalopathy disease known as Creutzfeldt-Jakob (Mad Cow), which is also called the laughing sickness, and is contracted by eating contaminated flesh.
raywest ★