This is quite nitpicky, but when Festus says, "Hey, Matthew," in the Long Branch as Matt comes in, the timing seems off. It seems like Festus said it too early.
Though he is billed as Roy, Doc refers to Roy Barcroft's character as Jonas, which is Wilber Jonas the character played by Dabbs Greer.
Suzanne Benoit, was primarily a television actress. Besides this Gunsmoke episode she appeared in three episodes of the series Gomer Pyle U.S.M.C., as various Colonel's daughters that Gomer was assigned to watch. She appeared in the years between 1964 to 1967.
Actress Jean Arthur (1900-91) was a classic movie star, her many film credits include, Mr. Deeds Goes to Town (1936), The Plainsman (1936), History is Made at Night (1937), Mr. Smith Goes to Washington (1939) and her last, Shane (1953). Besides this Gunsmoke episode her only other television acting role was as the star of her own TV series, The Jean Arthur Show, which lasted only a few episodes in the fall of 1966 before being canceled.