When Federale Gonzales is inspecting Charlie's identification he originally unfolds it so that all three panes are out, then when the camera cuts it is back to partially folded, only two panes visible.
When Raylan throws the man out of the trailer for a brief second he stumbles in the rain, even though there's no rain in the shot before or after that.
When the Mexican Federal Police pull up at the end of the episode one can see their vehicle is marked "Policia Federal;" however, in the Spanish language the word police is spelled policía (with the accent mark over the second letter i). An internet search of Mexico Federal Police vehicles will show all their vehicles spelled correctly.
When Raylan is trying to trace Winona's whereabouts, his computer screen displays flights from Lexington, Kentucky to San Juan, Costa Rica. The problem is that there's no San Juan in Costa Rica, at least not with an airport. The writers probably mistakenly conflated San Juan, Puerto Rico and San Jose, Costa Rica.