Character mistake: Trivette hands the man in yellow a bullet recovered from the plane Walker and Alex were traveling on, which was shot down by an assassin flying a P-51 Mustang. This man, and later Trivette, mistakenly refer to the round as a "50mm," when in reality, Mustangs were equipped with M2 Browning .50 Caliber (12.7 mm) machine guns. (00:30:25)
Continuity mistake: One of the men attempting to kill Walker holds up his AK pattern rifle after one of his crew members is killed. If you look at the rifle, you can see that the safety is on and as a result, would not fire if he squeezed the trigger. Before and after this shot, the safety is seen in the off position. (00:22:55)
Continuity mistake: The girl only has her right arm secured under the chair strap but in the next shot both of her arms are under it.
Borderline - S1-E2
Continuity mistake: When Walker is throwing the man after putting him in an arm lock, the stunt double isn't screaming, but the character is. (00:15:01)
Continuity mistake: The villain swings a desk lamp at Walker with his right hand. In the next shot, he swings it again with his left, and then it's instantly in his right hand in the next shot as he begins to strangle Walker.
Continuity mistake: Alex says that a painting her father gave her was destroyed by LaRue, and he's gone so that can never be replaced. Season 5 episode six "Redemption" introduces the still alive Gordon Cahill, her father.
Continuity mistake: When the criminals drive back to Walker's truck, the driver destroys three of his tires and the radiator by shooting at them. When he goes to unplug the CB radio, the right rear tire that was deflated has somehow inflated. When Walker returns to his truck, the tire is back to being deflated.
Character mistake: In this episode, the word 'development' is spelled wrong on the construction site sign (they spelled it 'developement').
Last of a Breed: Part 1 - S6-E6
Continuity mistake: During the shoot out, where the family got shot. The boy fell down face first and is still like that when Walker came to check him. Shown at another angle, he's lying face up. Showing the boy again, he's face down again.
Continuity mistake: Halfway through the episode, they are in a helicopter looking for Walker and the others in a raft on a river. Half the time, the helicopter is shown going upstream and half the time the helicopter is shown going downstream.
Revealing mistake: About 20 minutes in, the cops have a newspaper with the headline about the two guys they killed. They turn to page two which has a story about the next guy they are planning to kill. If you look at the picture, it is glued onto the story page. The left side is lifted. The actor must have been hired after the printing.
Continuity mistake: Alfi refers to her father as a High Steel worker, yet a short time later when talking to her Mom, she says he was a concrete worker. He was killed in a concrete accident.