The boardwalk sign "Tonsorial Parlor and Pool Hall" at around the 42:15 mark is a curiosity as the word "tonsorial" is never heard in modern times. Tonsorial is a fancy word that describes the work of those who give shaves and haircuts. It derives from the Latin verb tondere, meaning "to shear, clip or crop."
Chester tells Billy Hargis that "Acme Rooms" has beds for 25¢ a night, cheaper than the Dodge House. This is the first mention of this Dodge City establishment..
The gunfighter Carter's first name is not spelled out in the credits, so it could be spelled either "Bo" or "Beau".
Several times Amarillo is mentioned but Amarillo wasn't established until 1887, well after the time period in which Gunsmoke is set. They should have said Tascosa.