Slave Island - S1-E7
Continuity mistake: When Gambit tries to grab the gun, Cable stops him by placing his left foot on top of it. When the shot changes, it is now Cable's right foot that is on the gun. Additionally, yellow lane dividers in the middle of the road disappear when Gambit first reaches for the gun, and then reappear a couple of shots later. (00:12:15)
Chosen answer: Cost of shipping would be much cheaper. However, the Mississippi River System is connected to the Illinois Waterway, which continues to the Great Lakes Waterway. This means Chicago is connected to the Gulf of Mexico (which is accessible to South America). There would be no need to ever be on the road.
Bishop73