Albert calls marijuana "pot". The nickname "pot" comes from the Spanish word "potiguaya", which means "marijuana leaves". It's a Mexican-Spanish word that is a contraction of potación de guaya, which referred to an alcoholic drink made of marijuana leaves soaked in Brandy or Wine. The name became popular in the United States in the late 1930s and early 1940s.
The shooting gallery at the fair has only 10 targets (2 rows of five). However, Anna shoots 12 of these 10 targets for a perfect score. Even during her shooting, there are short cuts to the gallery which still only has 10 targets but 12 shots are clearly heard and Anna wins the prize for perfect score.
When Albert is learning how to shoot, he cocks the hammer twice before starting to shoot. After the missed shots, Anna reloads the gun. First she drops two bullets and when the angle changes she drops 6 more.
Anna knocks out Clinch and then rides off to Albert's house with Plugger by her side. However when she gets to Albert's house - Plugger isn't with her. Nor is he with her when she runs to Edward and Ruth's place to hide from Clnich. He reappears during the final gunfight between Albert and Clinch.
Albert takes Anna home back to her hotel after the dance. When she turns to kiss Albert for a second time she puts her hands on both sides of his face in the close-up. The picture then jump cuts to a wide shot and she moves her right hand to the back of Albert's shoulder and her left hand to the back of Albert's neck. Then when the camera jump cuts back to a close up of them kissing, Anna's hands are no longer touching/holding the back of Albert's shoulder or neck.
After escaping from Clinch, Anna runs away to Albert's house/farm to warn him about Clinch looking for him. She gets to Albert's house on a horse. After Albert dismisses her and tells her to leave out by the ridge we never see her leave with her horse. Where did her horse go?
When Anna first meets Foy and Louise at the fair, she moves her hand from Stark's elbow to his shoulder. In the next shot of her, her hand is back where it was before. In the next it's on his shoulder again, where it stays for the rest of the scene.
Anna has her cowgirl hat on with her when she leaves Albert's house. Later when she hides with Edward and Ruth at their place and when she's with Clinch in the town square as a hostage she doesn't have her hat at all with her. It magically reappears right at the end when she & Albert embrace at his house surrounded by the millions of flock of sheep.
When Edward goes to visit Albert after he is injured he states that he hasn't seen Albert in town for a week and a half. The cut Albert had on his right forehead would have still been visible as at least a scar but the area is perfectly smooth.
Photography is depicted erroneously in the film. Outdoor photography did not require the use of flash powder, thus sun would provide enough light. In average daylight, a photo would not require 30 seconds but only 5-8 seconds.
When Albert and Charlie are standing in the street for a gunfight several feet apart, it is impossible for their shadows to be close enough to each other to depict the obscene act depicted based upon their heights. One person would have to be very short for the body parts to line up as shown.
The DeLorean time machine in the film is actually the wrong one. The DeLorean that went back to the late 1800's would have had a Mr. Fusion unit on it. Instead, the one in the film is the first generation time machine with a plutonium reactor.
When Lewis is poured another drink by the pastors son the pastors son puts the bottle down and moves his hand away from the bottle before sliding the drink to Lewis but as he is sliding the drink he puts down the bottle again.
When Anna comes to the party in a big dress she reveals there is a large metal frame under it keeping the shape. Shortly after, when she drinks with Foy, she sits down with no trouble at all, and clearly doesn't have the frame anymore.