In his closing narration for this episode, the adult John-Boy says, "We never saw nor heard from A.J. Covington again." But three seasons later, in the Season 4 episode "The Abdication," the Covington character did return -- although played by a different actor. (He was played by David Huddleston in this episode, and by George Dzundza in the later one.)
At 33.00, A.J. sells his pocket watch, but in the next scenes he still has his watch in his pocket. At 40.37 the chain is missing from his waistcoat, but reappears again at 45.39.
A.J. Covington's time line is all messed up. He states that he is 45 years old; it being 1933, that puts his birth year as 1888. He tells John Boy he left home at 17 to become a writer which would be 1905. Later he says he had been in Cuba covering the Spanish-American War which ended 7 years earlier in 1898 when A.J. was ten years old. He also says he was tent mates with the writer Stephen Crane, who died in 1900, when A.J. was twelve, five years before he left home.
When John-Boy starts the truck after A.J. fixes it the truck lurches forward suddenly with the hood still open, prompting David Huddleston to blurt out "hold it."
The scene where the truck breaks down begins on a remote road surrounded by pine trees and mountain scenery. When A.J. comes upon the scene, it abruptly changes to the Warner Bros. backlot, completely different than it was seconds before.