About halfway through the story, as the saddle tramps come to see him about the gold, John Walking Fox's speech pattern has changed and he speaks a bit more like Indians speak in other episodes, but it's not as obvious.
The hotel clerk obviously doesn't want to rent a room to the Indian, John Walking Fox. This was his policy in another episode, but in yet another episode, he lets an Indian guest stay without any objection.
When the hotel clerk is outside showing everyone the $50 gold piece the Indian paid with, Matt asks him whether the Indian is in the hotel. After the clerk answers "yes", Matt goes to the correct room without asking which one.
As the clerk gives Teague the key to the room for John Walking Fox, a boom mic shadow is seen near Teague's left shoulder.
As with many Indians throughout the series, John Walking Fox speaks perfect English.
When Tigue holds his shotgun on the men who have captured John Walking Fox in his camp, he stands far too close to them. The man standing to the right could easily have grabbed the shotgun barrel and disarmed Tigue.