The amount and pattern of icing on the hat changes between shots.
The train station that Charles Chaplin's character "Lefty Lombard" departs headed for Texas is the same station (filmed from the same direction facing a water tower) that he arrives at in Devil's Gulch.
The Mexico Texas border is marked by a sign on dry land. The entire Mexico Texas border is in the middle of the Rio Grande.
In the train station, the board for Train 523 starts out logically, leaving from New York City and traveling north to Albany and then heading west. However, after leaving St. Louis, the next stop is Tegucigalpa (Honduras) which is over 2,500 miles. The train then "backtracks" several hundred miles to Dallas, TX and continues west. Having a single international stop on the route, especially as it is neither Canada (near Niagara Falls, NY) nor Mexico (across the Rio Grande from Texas) is neither logical nor fiscally prudent.