Other mistake: The Duke is picked up in New York. They are headed to L.A. via Chicago. Jack has Eddie wire $500 to Amarillo, Texas. The route from Chicago to L.A. would not take them anywhere near Texas.
Continuity mistake: When Jack and the Duke are in the restaurant car of the first train, Jack is eating a chicken leg in one shot. In the middle of a sentence he changes to eating jelly and ice cream, which he finishes. In the very next shot his bowl is full of jelly and ice cream again.
Jack Walsh: Here come two words for you: shut the fuck up.
More trivia for Midnight Run