Deliberate mistake: In the final battle where El Guapo's men are fighting the townspeople, look closely to see that they are really just fighting Lucky, Dusty, and Ned. When the towns people appear, their outfits are very different from the real Amigos.
Deliberate mistake: Save for one scene where Ned begins to reload before declaring he is an Amigo for real, no one throughout the movie reloads their revolver despite firing many more than six times.
