The passport seen is far too modern, not introduced until 1920. Passport books were not issued until 1915; contemporary 'passports' would have been papers rather than what we see.
At just past the half way point, after Maverick is talking to the owner of the ladies' shop about where the Adams live, he walks out of the front door. In the distance, in the upper center of the frame, there is a parked car visible. A few moments later, when the Marshal starts marching Maverick away the car is briefly visible again. What's also odd about this is that it appears they attempt to hide it from view, by having a man on horseback on the street, and then they have Gage Clarke stand right in front of the camera, as if he's there to block the view. One wonders why they didn't just move the car.
During the establishing shot of Elwood, Kansas, tall hills are visible behind the town. Kansas is a notoriously flat state.