The Outlaw - S1-E2
Continuity mistake: In "The Outlaw," when Paladin and Holt talk after Paladin has climbed up the rope, Paladin's black shirt alternates from covered with dirt in the close-up shots to clean in the long shots. (00:15:00 - 00:16:00)
The Statue of San Sebastian - S1-E39
Continuity mistake: 1-40 "The Statue of San Sebastian": At the end, after Paladin shoots him, Sancho falls forward and rolls onto his left side with his face up. When the padre rushes out of the mission a moment later, the "body" is lying face down, and the priest turns it over again.
The Protege - S2-E6
Continuity mistake: When Sprague is practicing shooting for the second time, we see that Paladin has put up a new target with no holes in it. Sprague draws his revolver and fires three shots but the cut to the target shows 4 holes in the center. He then proceeds to fire the other 3 shots. (00:10:15)
Lady on the Stagecoach - S2-E18
Continuity mistake: About 1/3 into the show, Paladin is walking towards the stage house, there are two bullets sticking up in the back of his gun belt. Once inside, all the bullets are now pushed down in their proper positions in the belt.
Continuity mistake: When Dink tosses Paladin's business card back to him while Paladin's leaning back in a chair, it lands on his stomach and falls down almost to his waist. After Dink speaks, when they cut back to Paladin, the card is up by his heart. (00:13:50)