The tent at the end made of American flags would be in violation of several rules of US flag etiquette: it displays some flags union down, it is touching things beneath it (the framework and the ground), and is displayed in a manner that can result in it being, torn, soiled, or damaged.
The camera and camera crew can be clearly seen in one shot during the bar brawl.
When Billy is being interviewed by the press after stopping the bank robbery, he tells them to come check out the show "just off I-80". The film is set in Montana and Idaho, and Interstate 80 does not pass through either state.
When Bronco Billy meets with the sheriff alongside the road you can see a microphone rise up next to Billy's car, parked behind him.Then you see it lowering slowly down next to the car.
Running Water says she is "Big Eagle's squaw". Even in 1980, "squaw" was derogatory, and a Native American (even an adopted one) was very unlikely to use it.