Factual error: The Joads take off for California. They pass a sign for Route 66, so they are already headed west on Route 66, between Tulsa and Oklahoma City. They then see a sign for Sallisaw City Limit. Sallisaw is in the eastern part of the state, well south of Route 66. They would never have seen a sign for Sallisaw after they reached Route 66 since they would have been far north or far west of Sallisaw. They pass Checotah, which is west of OKC. Then they get to OKC where Route 66 can be found. (00:36:52 - 00:37:15)
The Grapes of Wrath (1940)
1 factual error
Directed by: John Ford
Starring: Henry Fonda, John Carradine, Charley Grapewin, Jane Darwell
Genres: Drama
Other mistake: Noah, the brother, just disappears from the movie with no explanation at all.
Ma Joad: Well, Pa, a woman can change better'n a man. A man lives sorta - well, in jerks. Baby's born or somebody dies, and that's a jerk. He gets a farm or loses it, and that's a jerk. With a woman, it's all in one flow, like a stream - little eddies and waterfalls - but the river, it goes right on. Woman looks at it thata way.