When Major Beck first arrives in "Reconstruction," his uniform has the flag of the Allied States of America, but the front of the uniform says "US Army."
The Rocky Mountain Front Range cannot be seen from anywhere in northwestern Kansas.
In the pilot, Jake Green drives through miles of what looks like prairie as he returns to Jericho. In fact, the terrain looks like California's Central Valley. Later in the series, much of the action set in the countryside was clearly not filmed in Kansas. It is the hilly scrubland of the montane chaparral around Los Angeles or points south, filmed during the summer.