Revealing mistake: At the end when Li'l Zé (Zé Pequeno) and his crew want Rocket (Buscapé) to take a picture of them in the street, a long-haired boy with a blue shirt is the first to be killed in the final shooting. A couple of seconds before he is shot in the chest, the shape of the blood pack is visible under his shirt.
Visible crew/equipment: The narrator explains that the traffic of drugs is a business just like any other. As we hear the words 'the police receive their part', a boom mike is visible at the top of the screen.
Other mistake: After Knockout Ned's brother is killed, he attacks Lil Ze and his men with a six shot revolver. Yet somehow he fires in excess of 9 shots without reloading.
Continuity mistake: When Shaggy (Cabeleira) strikes the first room in the motel, the clothes hanging next to the door change positions in one shot.
Deliberate mistake: In many scenes bullets are shown striking things and sparking (this is especially visible on the attack on Knockout Ned's house when a bullet strikes a chair and gives off a huge spark of light). In real life, only special bullets with incendiary materials (meant for starting fires) cause sparks, and this is only when they're fired against metallic objects. It is impossible that a bullet striking a chair would give off a spark.
Revealing mistake: The slow motion shot of Zê Pequeno and Bene walking, ready to kill the trafficants, is flipped, look at the reversed words on the wall.