Dr. Loveless died of ulcers caused from frustration at West and Gordon constantly thwarting his schemes. This gives conflicting information about the date of his death--Loveless Jr. speaks of it as "five years ago", which would be 1880, but the dates on Loveless's tomb are "1848-1883."
Disguises: saloon girl
Gadgets: spring-out knife in boot toe
Disguises: snake charmer Gunga Din, Ambassador of Lichtenstein
In the final credit "A Michael Garrison Production In Association with the CBS Television Network," the word television is misspelled.
After Jim runs into Lydia, she gets angry with him and shoots at him with her pistol. When she fires at him she fires seven bullets, but she is shooting with a standard six chamber pistol, which means she should have only six bullets.
In the opening credits, we see Jim kissing the woman who attempts to knife him, but she remains standing. At the end of act 1, we see her sitting on the floor. How did she get there? [The original opening showed West punching her, knocking her to the floor, but this was changed before broadcast. The artwork at the end of act 1 was not changed to match it.]
When Jim throws the exploding billiard ball at Juan Manolo, the pool cue has already turned into the hidden spear, but after Jim throws the billiard ball there is a closeup of Jim turning the pool cue into the spear.
Disguises: Drunken soldier and Mexican peasant
When Jim climbs over a large stone wall to enter into General Flory's compound, he lays on top of the wall and watches as Roxanne tries to escape. The wall wobbles under his weight as he moves around, revealing that it is actually a man-made wall not the original stone wall shown him climbing moments earlier.
When Roxanne goes for the turkey she knocks over her wine glasses. In the next shot the glasses are standing upright.
When Jim is walking to find Captain Jackson there is a well near by. When he gets attacked by the guitarist, the well disappears and the area becomes completely open.
In the opening shot, Jim is leaning against the bar. The very next shot he is in the middle of the room and turns to walk to the bar.
When Jim escapes the spike bed, the spikes still have a way to go before they reach the bed. However, the shot after he escapes, the spikes are resting on the bed.
When Jim changes his shirt in the laboratory he does not button up the shirt. However, when he walks into the living quarters it is fully buttoned.
Disguise: a Mexican Peon
The final line of the episode appears to have been dubbed since Ross Martin's lips hardly move at all.
The shot of Dr. Loveless's carriage escaping after shooting an arrow at West is the same shot as Artie's carriage turning the corner (after picking up Jim), except reversed and shown at faster speed.
When Jim puts Dr. Loveless's walking stick in the clock, it is clearly not Jim's hand. Jim is wearing long sleeves while the arm that puts the walking stick in the clock is not.
After Jim uses the gadgets in his carriage to get rid of Loveless's men, the carriage is still shaking as if it is moving, but when Jim leaves the carriage the carriage is not moving at all.