Just after the opening of the film at the steel mill, we see a freight train going across a high trestle in silhouette, with the roofs of the cars perfectly empty, but immediately we get a closeup of the train's roofs, looking forward, and it has scores of migrant workers sitting and sprawled on the roofs of the cars.
Stuart Margolin who plays the mill foreman killed early in the movie can be seen again on the left in the background during the "clogging" dancing seen later when they are working on the farm.
Towards the end of the movie, when Bill is shot and killed in the river, there is a very distinct shot of him falling face-first into the water. In the very next shot he is shown floating on his back.
Towards the end of the movie, Bill fires three shots from a double-barreled shotgun without reloading.
At the beginning of the movie where the train is pulling up toward three red grain elevators with sunburst symbols on them, people are seen hopping off the train. Stenciled one of the train cars is A.P.R.A., which stands for Alberta Pioneer Railroad Association, which never had a rail line operating in the panhandle of Texas. This portion of the film was shot in Alberta, however. Some cars also have "C.P." on them, which stands for Canadian Pacific - another railroad company.
The Texas flag is displayed upside down in a few shots.
When the farm manager sees the farmer laying dead in the field, the farmer's right arm is on the ground. In the next scene when he is beside him, his right arm is standing straight from the elbow.
The two WWI aircraft in the film had their first flights in December 1916 (the Sopwith) and July 1917 (the Fokker Triplane) so it's highly doubtful that either one was flying in Texas in 1916-17, when the story takes place.
In the hunting scene, ring-necked pheasants are clearly seen. Ring-necked pheasants, a non-native game bird, would not be introduced to Texas until 1933 or 1934.
The biplane in the "Flying Circus" is a De Havilland DH 82 Tiger Moth, an aircraft first produced in 1931.
While the film is set in 1916, there is a 1920 and a 1923 Ford Model T present, and one of the trucks taking the workers from the train to the farm is a 1926 International Harvester S-24.
Any Fokker Dr.1 triplanes available just after WWI would have the original rotary engine, rather than a radial engine. The difference is that the rotary engine spins along with the propeller, and a radial engine doesn't. The Fokker in the 59th minute clearly has a radial engine.
At about 7:25 into the movie, we see a bucolic farmyard scene, with a group of white ducks waddling by...yet we hear sound effects of Canada Geese.
After Bill and Abby drink wine in the river, Bill makes a remark and Abby replies, "Nobody asked you to." Her lips don't match the audio.
Boom mic on porch.