During their proposal dinner the bubbles in the champagne glasses rise & fall as the shot changes.
Waiting at the airport, he has written "I am a billionaire" on a page hand dated December 26, 1968, just before he is called to the phone to hear that Hamilton has been in a car accident. When he gets to the hospital room seeing Hamilton in a coma, he pulls out his journal and opens it to the page he had been writing at the airport, and now it shows as "I'm a billionaire" and the date on the page reads "December 28th 1968." Then, he flips between previous pages in his journal, and then back to the page he is writing on again, and now it shows "I am a billionaire," but the date is out of the frame, then in the next frame it shows "I am a billionaire," but the date written is "December 26th, 1968".
When Red is waiting for his chartered plane at the airport, and sees the newspaper article which makes him realize he is a billionaire, he starts writing in his journal, and then reads it back to himself. His voice says "I became a billionaire," but the writing shows "I am a billionaire."
When the teenage Red Stevens jumps off the train he had stowed away in, the train is moving real slowly. Even though the train is coming into the station & slowing down (as evidenced by the braking sounds), the train is obviously moving much faster as soon as he stands up.
1:26 When Red writes in his journal he says, "I became a billionaire" but he writes I am a billionaire. Later when he is in the hospital with Hamilton he writes in his journal on the same page. Sometimes it says I am a billionaire and sometimes it says I'm a billionaire.
Red's lawyer tells the other lawyer that the statute of limitations in Texas for filing suit on a mineral rights dispute is two years. It is, and was at the time, four years.
The $10 bills that Red mails home have no serial numbers.
The newspaper article Red reads calls Andrew Carnegie a billionaire. Carnegie's wealth never approached a billion dollars. The article further says Carnegie's foundation donated funds for a library in Baton Rouge to begin construction in 1942. The last Carnegie library was constructed long before 1942, and while there were some in Louisiana, there was never one in Baton Rouge.
The front license plate on the truck driven by Peter Fonda has the number 580-277, while on the back is 689-232. Both have TEXAS above the numbers, with 1942 below, and gold letters on a black background. An actual 1942 Texas license plate was a different size, had black letters on a gold background, with TEXAS above the numbers and 1942 below. The plates were for a passenger car, while the truck would most likely have had farm truck plates. The date is later established as September, 1941, so the truck should have had 1941 plates.
A pickup in the oilfield in 1955 has a Texas license plate, white on green, with no date, and the number 90E-LXQ. Neither the color (green) nor the numbering scheme have ever been used on Texas license plates. Texas plates in 1955 were black on white, with a different numbering scheme.
The train engine and boxcars shown when Red is beginning his journey were not in use in 1941.
When Jacob Early (Peter Fonda) pays the workers, including Red, for the completion of the new fence, the paper money was very clearly $20 bills, with the most current design, meaning the bill design from 2003, with the larger '20' in the upper corners, and was clearly not available in 1941.
When Mr. Wescott orders a single hamburger from the diner in Tyler, Texas, he is charged $3.50. By comparison, McDonald's sold their first hamburgers for 15 cents in 1955.
When Red is negotiating in the office of the refinery owner in 1968, the view out the office window shows a skyscraper of a very contemporary design with lots of green glass. This contemporary building would not have been built until the late 1980s or later.
In the 1941 dance party scene, the guitarist in the band is using what appears to be a thin, hollow-body electric guitar. Guitars like that didn't become available until about 1958.
Supposedly set in Tyler, Texas, however, there is a North Carolina state flag flying in front of Alexia's hospital.
When Red goes to the high school in Tyler, Texas, to meet Hannah, the sign on the school says Wentworth Consolidated School, which is located in North Carolina.