Near the beginning of the movie, Standing Bear and John Colter see Grayeagle on a ridge with the setting sun behind him. But, the sun is up high and behind Standing Bear and Colter when the camera is on them as they look toward Grayeagle.
In the beginning scenes, when Grayeagle is seen on the ridge the first time and then again the next day, you can tell that the exact same clouds are in both scenes. You can even see that the sun has moved in the sky about five or ten minutes between scenes.
At one minute into the movie, during the opening scene of the Cheyenne village, two dogs can be seen tussling over a large chunk of meat. At approximately 14 minutes before the end of the movie, when Chief Running Wolf is on a stretcher being carried out of his tepee to watch the braves capturing hanging hoops from a galloping horse, the same two dogs can be seen at what looks like the same chunk of meat.
On the 2016 High Definition restoration (available only on Region-A Blu-ray in North America), during the opening monologue, the voice is slightly out of sync with the video compared to previous "unrestored" Standard Definition versions still available on streaming services like Netflix.
In various scenes, you can tell that the "blades" used in the movie appear to be rubber props because they can be seen to flop around. This is especially true of Scar's battle ax as he's waving it around. The blade can even be seen to be bending toward the side. You can also see the knife used in the "playing coup" scene to flop around a couple of times especially when Colter is wielding it..