The Men That Corrupted Hadleyburg - S2-E18
Audio problem: Final sound edits were incomplete on this episode when star Pete Duel committed suicide, so his dialogue is "looped" by another actor in several places. Though it's an excellent imitation, it is most noticeably not Duel's voice when Heyes and Curry are waiting for Harry in the opening scene, at the campfire with the Tapscotts, and when Harry tells them about the trial's outcome.
The Men That Corrupted Hadleyburg - S2-E18
Continuity mistake: In the opening shot, Heyes and Curry sit outside the Bannerman office pretending to read a copy of the Denver Post. In full shot, they're holding/hiding behind a single unfolded paper. When we cut to a tighter two-shot, though, each of them holds a separate newspaper. (00:02:00)
The Men That Corrupted Hadleyburg - S2-E18
Factual error: Heyes plays blackjack with cash instead of chips. When he bets the limit of $1000, he pushes two small stacks of coins toward the dealer. A thousand dollars in coins would have made a substantially larger stack than this. Even if they were $20 gold pieces (which they don't appear to be) the two piles would have to be comprised of 25 coins each, which they are not. (00:30:00)
The Men That Corrupted Hadleyburg - S2-E18
Factual error: Heyes and Curry are reading the Denver Post in the beginning scene, but the Denver Post was not published under that name until 1901, nor published under its earlier name, The Evening Post, until 1893.