Continuity mistake: The date of Helen Kimble's murder is given here as Sept. 19, 1961. Previous episodes, however, had established it as occurring on Sept. 17, 1960.
Continuity mistake: In flashback, we see the one-armed man kill Helen Kimble by striking her with a heavy lamp. All through the earlier seasons, though, we were repeatedly told that Helen had been strangled. (00:28:50)
Continuity mistake: Throughout the show's early episodes, Helen Kimble's dress on the night she was murdered was described as blue or blue-gray. Here, in the flashback to the murder, she's wearing an evening gown that isn't blue or gray, but pink. (00:27:45)
The Shattered Silence - S4-E27
Continuity mistake: Kimble is wounded in the left arm. But at the end, as he makes his way down the mountain, he's holding and favoring his right arm. (00:49:00)
The Breaking of the Habit - S4-E19
Continuity mistake: Kimble was gimpy early in the episode, because he had been shot in the leg. During the episode he refuses any treatment. But near the end of the episode he is seen walking without a limp and in perfect health.
Dossier on a Diplomat - S4-E25
Continuity mistake: Kimble tells Hobart there's no new evidence that could get him another trial. But maybe Dr. Kimble is suffering from amnesia. In the past 3 1/2 seasons, he's uncovered no fewer than four potential witnesses who could provide new evidence in a second trial. (00:22:35)
The Breaking of the Habit - S4-E19
Continuity mistake: Kimble enters Sister Veronica's room, closes the door and walks toward her. Then the shot cuts to a closer angle, and he's closing the door over again. (00:31:55)
Continuity mistake: Rafe and Kimble escape handcuffed together. They break the linking chain with a rock: each then wears a single bracelet. But when he kneels to examine the dead deputy, Kimble is wearing a cuff with an intact chain and an empty bracelet hanging from it. (00:28:45)
A Clean and Quiet Town - S4-E3
Continuity mistake: The rear tires on Kimble's car get stuck in the sand and spin when he's trying to U-turn and avoid the roadblock. After the police order him to drive back to town with them, however, the car wheels somehow unstick themselves, and Kimble has no trouble at all driving out of the sand pit. (00:48:25)
The Other Side of the Coin - S4-E16
Continuity mistake: When Sheriff Corby arrests Kimble outside the boarding house, the front door is open and the porch light is on. In the next shot, as they get in the car and drive away, the house door has closed itself and the porch light is off. (00:27:55)
Continuity mistake: Kimble's nephew Billy is mistakenly listed as "Bobby" in the end credits.
A Clean and Quiet Town - S4-E3
Continuity mistake: The one-armed man, whose name was earlier established to be Fred Johnson, is for some reason re-named Cramer in this episode's credits. (00:49:40)
Continuity mistake: The one-armed man orders Chandler to get up off the ground. In close-up, we see him sit up. But in the very next shot, he's flat on his back and sits up again. (00:11:50)
Continuity mistake: Kimble walks out of Jean's apartment, leaving his bag behind. But in the very next shot, he's holding the bag as he comes out of the building. (00:48:25)
The Other Side of the Coin - S4-E16
Continuity mistake: Corby hides Kimble in the trunk of his car. When it's partially opened, we see Kimble in a horizontal bar of sunlight. After Corby slams the trunk shut, we see another shot of Kimble, who should now be in the dark, still illuminated by the bar of sunlight. (00:47:20)
Continuity mistake: When Rafe is shot at the end, the gun he was holding in his right hand disappears between shots. (00:45:15)
Answer: Production vehicle models aren't in sync with the calendar year. The '65 Mustang began production in March 1964 and first sold in April 1964, before it was "introduced" the following year. I don't know which model was seen in the episode, but the 2+2 fastback was sold in September 1964. The 1964 film "Goldfinger" uses a 1965 Mustang as part of Ford's product placement. Basically, in the 1930's, FDR ordered automakers to release vehicles in the fall of the preceding calendar year "as a means of facilitating regularization of employment in the industry." Now, automakers can release new models as early as Jan 2 of the preceding year.
Bishop73