Factual error: An egotistical, prissy and dishonest lawyer like Mr. Fletcher wouldn't make the mistake of allowing his name to be misspelled on his office door. It reads "Winfred Fletcher." His first name, as it's pronounced throughout the episode, is "Winford."
Plot hole: Well within earshot of the others in the small room, Curry comments to Heyes (purely for the viewers' benefit, since Heyes already knows it) that if Lom Trevors is killed, their amnesty will go with him. This information should have blown their cover, but for some strange (and unbelievable) reason, no one wonders what he's talking about.
Trivia: The stiff-necked, humorless Sheriff Tankersley was a nose-thumbing parody of a real (and really unpopular) person. William Tankersley was a notoriously prissy network censor who was infamous at the time for trying (unsuccessfully) to stifle the naughty bits on All in the Family.
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Trivia: This was the first episode with Roger Davis replacing Pete Duel as Hannibal Heyes. Duel's tragic suicide apparently meant nothing to insensitive network execs at ABC. They insisted that the production schedule proceed uninterrupted, and that all scenes already in the can with Duel be reshot with Davis. There are three places in the episode, however, in which Duel can still be recognized: in the series intro, pulling a safe from a train (this shot remained for several episodes before being trimmed); walking into the hotel from the stagecoach; and in the scene where Heyes convinces Curry to go talk to the Devil's Hole Gang (shots taken over Heyes' shoulder are of Pete Duel, whose hair was much darker than Davis').