Ride a Cock-Horse to Laramie Cross - S4-E23
Continuity mistake: The dye job on young Clint Howard's hair is inconsistent from scene to scene. It's dark black at the start, but pales to a shade much closer to his natural blond color in many shots later on. His brown make-up (a laughable effort to make a blue-eyed Anglo kid look Hispanic) also varies, and disappears entirely in some of the covered wagon scenes.
One Spring Like Long Ago - S4-E24
Continuity mistake: In the general store, Randy rests his arms on a partition, then takes them down and turns away. The following shot is mismatched: he's immediately leaning on the partition again, without enough time to return to that position.
Continuity mistake: After the fight at the train depot, Colonel MacKenzie's rumpled ascot straightens and reties itself between shots.
Continuity mistake: The red draperies framing Hannah's train-window flashback do not even vaguely resemble the drapes seen on the same window in every other shot aboard the train.
Continuity mistake: When Trampas and Bob meet Mr. Coulter on the road, their horses are close enough to touch flanks. In the reverse-angle shot, however, they're several feet apart.
Continuity mistake: After Frank locks him in the jail cell, the Virginian stands with his hands holding the bars in full shots, but in close-ups, his arms are extended through the bars in a completely different position.
The Wolves Up Front, the Jackals Behind - S4-E26
Continuity mistake: Randy walks into the blacksmith's barn with a guitar strapped to his back. When he steps inside in the very next shot, the guitar has disappeared. (00:03:20)
Continuity mistake: Stacey places his hat on the wagon seat before confronting Lee Caulder's men on the street. When he picks the hat up again, it has moved several inches to the right. (00:47:35)
Continuity mistake: The miniature train used in all the night shots (it passes the same artificial mountainside several times), is pulling three passenger cars and no baggage car. When the full size train arrives at the station the next day, it has a baggage car and only one passenger car.
Continuity mistake: At the beginning of the show, the deceased man is found inside a house. At the end of the show, the killer said the deceased man hit his head on a rock.
The Wolves Up Front, the Jackals Behind - S4-E26
Continuity mistake: At beginning Randy dismounts outside the blacksmith shop wearing a guitar. When he enters the shop there is no guitar. (00:01:00 - 00:02:00)
Continuity mistake: The Virginian is riding in a buckboard wearing a gun and holster. He gets out of the buckboard with no gun, but when the camera angle changes his gun is back. (00:21:00 - 00:22:00)
Continuity mistake: Trampas is shot and falls face down, unconscious. A second later he is lying face up.