Goofs

At 1:20:33 Big Beard appears without his right leg. Later (1:23:44), that leg appears on the screen but at 1:23:49 and seen from the opposite side, it is a LEFT leg.

When Naru is using one of the fur traders as bait, the Predator's weapon had previously severed his right leg above the knee (1:20:33). From the Predator's heat vision point of view, he is lying on his abdomen and his right leg and foot are intact, but his left leg isn't (1:23:49).

At 1:16:00 on the Frenchmen's campground there is a fight scene between Predator, Taabe, and Naru.

When Taabe is stabbed by the Predator in front of Naru there is blood splatter across the right side of her face. In the next few shots there is no additional blood splatter. A few shots later, she once again has the blood splatter all across the right side of her face.

At the 29:35 mark, the unstrung bow at Naru's right shoulder disappears when she's seen from behind.

The Predator does not show any signs of weakness despite being injured in several fights. It is first injured by the wolf which clearly bites him in the leg. Later during the encounter with the wild bear you can clearly see the bear biting in the Predator's shoulder creating a big splash of blood. Later is gain injured by the Indian warriors and still behaves normally. Any living form would have been incapacitated to some degree after such injuries.

At 23:00 the mountain lion roars. Mountain lions don't roar. They scream.

There are no scavengers feasting on the field of dead, skinned buffalo. No crows, vultures, coyotes, wolves, bears, etc.

In the early part of the movie, Naru sharpens her stone axe, as if it were metal. Scraping a stone across another stone edge won't sharpen either.

One of the white men hobbles back to camp with his lower leg completely severed. He would have bled out and died long before making it there. Even if the Predator's weapon stopped the bleeding while embedded in the wound, once Naru removed it there would be nothing stopping the bleeding and he would have died then.

Arteries have sphincter muscular layers which will spasm and slow the bleeding. The Predator's weapon stopped the bleeding just long enough for clotting to begin and Naru fed him the orange flower that slowed the bleeding also. All that aside, he would have bled out eventually as the blood trail shows a lot of blood loss.

After trying to hunt the white tale, the dogs tail gets caught in a trap, a foothold trap. The tail can't trigger that kind of trap.

One of the white men plays dead and the Predator cannot see him because Naru gave him medicine that lowers his body temperature. Hypothermia sets in when the body's temperature drops below 95° F (35° C). The body temperature would need to be well below that in order to make him invisible to the Predator. Naru later takes the medicine herself to battle the Predator without it being able to see her. Symptoms of hypothermia include shivering, slurred speech, shallow breathing, a weak pulse, clumsiness or lack of coordination, drowsiness, confusion, and loss of consciousness. She would be in no condition to engage in combat if her body temperature was that low.

Yet a coating of mud works, indicating the Predator's visibility threshold is somewhat higher than 95° F (35° C).

The name plate on the 1715 Raphael Adolini gun has a different shape than the one in Predator 2 (1990).

There's no telling what changes or improvements the gun may have undergone in the hundreds of years that it was in Predator hands. It could possibly shoot laser blasts now. Lt. Harrigan hasn't reported back.

There is nothing to indicate this is the same firearm as the one in Predator 2 or Alien vs. Predator. At the end of the movie, the flintlock is in the tribal chieftain's possession, not the Predators.

A stone axe (tomahawk) would probably not be thrown, as they were considerably more breakable than later versions of iron or steel. Blunt war-clubs were more commonly used in combat, prior to trading with Europeans for steel axe-heads.

She wasn't a warrior, she had no steel axe-heads and a war club is of no use for gathering roots. She learned to throw it in the same manner as the Chinese peasants learned to use their farming tools as weapons.

Some viewers thought that when Naru finds the killed buffalo herd she picks up and sniffs a shell casing, one hundred years before they were invented. She actually picks up a half-smoked cigar.

Living in a tribe of hunter-gatherers 300 years ago, Naru would not have shaved her armpits.

However, premodern female characters are rarely ever depicted with unshaven armpits. This is a simple stylistic choice common in the vast majority of period films and not a mistake here.

Around 50mins into the movie, shortly after Wasape ties Naru's wrists together, the group encounters the Predator for the first time. During the fight, Naru scrambles to Wasape's body to recover her tomahawk and to cut herself loose. At the point where Naru picks up the tomahawk, Naru has her wrists together, but they are no longer tied. Naru then motions as if to slice through the rope, however there is no rope in place.

When Naru is throwing her tomahawk, she peels some bark strips and braids them together to make a long cord. When she is later stuck in the mud bog, she throws her weapon to pull herself out, and the cord appears to be a modern day twisted hemp cord with no braiding visible.

During Taabe's war chief ceremony, one of the Tribesmen standing by the fire, to the left, momentarily looks directly into the camera.

When Naru is found by the search party sent by her brother to take her home they have a fight, and at the end she is punched in the face and knocked down, yet after that there is no sign of violence in her face nor any bruise.

The movie takes place on the Northern Great Plains, but says that the warriors are Comanche. The Comanche were not a tribe on the Northern Great Plains. The Comanche were in Texas, eastern New Mexico, and the most southern part of Kansas. Tribes of the Northern Great Plains included Assiniboine, Sioux, Crow, Blackfeet, Plains Cree, Ojibwa, Mandan, Hidatsa, and Arikara. The Northern Great Plains extended from Northern Nebraska to Canada and didn't include any part of the traditional Comanche territory.

When Naru floats down the river immediately after the bear attack, there is clearly a metal triangle mile marker post on the river bank in the distance on the right.

The movie was shot mainly in the wet Boreal forests of Western Alberta near Calgary, on the outskirts of the Rocky Mountains. This is about 1000 miles north of where the Comanche Nation lives and not at all the dry Great Plains. Hunting takes place on foot in the forests instead of Buffalo hunting on horseback on the plains. Grassland is only shown around the camp, while almost all panorama shots show forested hills and the whole plot takes place in the forests. There were no Comanche Villages this far north. This may be because the Predator Ships (seen carved into the rocks at the end of the Credits) made sure there are no Comanche in the area since.

The film is set in 1719 and shows large scale bison slaughter by the fur traders, which makes that scene approximately 150 years too early.

The Métis of Canada had organized hunts for trade as early as the 1770s, however it wasn't until the mid-19th century, or more accurately, the 1870s that large scale bison eradication occurred by settlers and the military.

At approximately 4:20 Naru's dog's tail gets caught in an iron trap. It is a Conibear, named for its Canadian inventor, trapper Frank Conibear. His first designs date from the 1920s, however Frank did not patent his "gin" (mechanical) trap until 1957, and it only became commercially available the following year. The story is set in 1719.

Naru rams a knife through the chin of a Trapper and it pokes out the top of his head. She pushes the blade through bone and muscle without any effort whatsoever.

Naru is able to break off one of the Predator's mandible tusks with great ease as if she possesses superhuman strength.

It's a big part of Predator lore that the alien only ever kills those it sees as "worthy", or something resembling "a fair fight". But the Frenchman with the amputated foot who teaches Naru how to use a pistol is unarmed and incapacitated, lying flat on his back, seemingly near death. Yet the Predator kills him anyway.

It seems to be implied that this happened because the alien was startled by the scream of the Frenchman, made invisible to the Predator's heat-vision, by Naru's drugs. But this doesn't really change anything; It's still a violation of the series' central lore; That the Predator only kills "with honor", in mutual combat, against an armed and/or dangerous adversary, because it's motivated by some alien version of "sport-hunting".