When Zapata and the elders are exchanging old sayings, his bandolero on his left shoulder displays the buckle holding it together. Near the end, it can no long be seen.
The real Zapata never had a hands-on role in executions. While he would order the executions of close aides, he was never present as he could not bear to watch.
The real Zapata was never tempted by power and had zero interest in politics. He despised Mexico City and left after arranging the new government with Villa. The scene where the delegation arrives from Morelos with a complaint about Eufemio never happened.
The scene of the peasants rescuing Zapata from the police is fiction.
Burgos was Madero's first choice to lead the revolution in Morelos, not Zapata. Zapata sent Burgos to Texas to meet with Madero to discuss an alliance. Burgos returned with a message from Madero that Zapata should serve under Burgos.
Eufemio was never criticized by Zapata.
The page of the 'Mexican' newspaper which Señor Espejo is reading (headline: 'El General Pancho Villa') is formed by clippings from an Argentine newspaper (from around 1935).
In several scenes where cannons are visible, it is clear they are cheaply made fakes.
In a scene set in 1910, Mexican dictator Porfirio Diaz uses a ballpoint pen to circle the name of Emiliano Zapata, but... the ballpoint pen was not in use until about 1940.
Marlon Brando, amongst other actors, appears in brown-face.
When Zapata rides away across the plaza after a confrontation, his pistol falls out of his holster without his noticing (at about 01:10:00).