Corrected entry: At the start of the last race it shows the horses at the starting gate in a shot from behind with the helpers behind the race horses. Then it moves to the front of the starting gate, and if you look under the stalls you can't see the helpers' feet. (02:03:00)
Corrected entry: Red's parents didn't lose their money in the stock market, as the movie shows. His parents owned a brick-building company and lost their business in a flood. They ended up on the streets eventually, just not in the way the movie portrays. (It's in the book)
Corrected entry: In the scene where Mr. Howard is talking to the reporters about a match race with War Admiral, when the camera is on him at the train station, in the sky behind him you can see jet contrails. Jets weren't invented yet in 1936 or so.
Corrected entry: While Pollard is undergoing surgery in the Baltimore hospital, seated together in the waiting room are Mr. and Mrs. Howard, Tom Smith, and Seabiscuit's groom. The Howards and Smith are white, the groom is black. In 1937, Baltimore was just as segregated as any city in the Deep South. The groom would never have been allowed in the white folks' waiting room. (01:31:00)
Corrected entry: In the scene where Elizabeth Banks and Jeff Bridges are debating whether to let Tobey Maguire ride, they are looking at the rolling ball toy and Ms. Banks says, "I never could get the damn ball to stay in the hole." Then it cuts to a shot of her holding the toy, and you can see a corner of her mouth. Then she says "Just let him ride, Charles", but her mouth does not move.
Corrected entry: In Red's accident scene, when the horse rears up from the tractor backfire, Red is sitting normally on the horse; that is, he is facing forward with his left foot in the left stirrup and right foot in the right stirrup. After the fall, we can see Red's foot is caught and he is being dragged. The problem is, his right foot is caught in the left stirrup. How did that happen? Better question, why? It is a difficult stunt to begin with and being dragged with the free foot behind or under the horse is just too dangerous.
Corrected entry: Tom Smith gets off his horse on the once open range and walks over to what is slowly revealed to be a barbed wire fence. He inspects and touches it in a manner that implies that he has never seen anything like it. At this point in history various forms of barbed wire had been in use for about fifty years. It is unlikely that a man of Tom Smith's age and occupation would not be familiar with it.