After Oscar is beaten up, he is treated for a vertical cut on his upper left and above. The next day it's healed and he has a small vertical cut on his lower lip.
After Oscar's interview with the ICE representative, the guard puts his right hand on the boy's right shoulder but in the next scene as they began walking, the soldier has his right hand on the boy's left arm.
When Oscar throws the sealed plastic bottle at the bully, it explodes against the back of his neck. This would not have exploded because Oscar did not remove the aluminum foil cover from the bottle.
The phone number Oscar provides the journalist to contact his uncle, is in the 555 exchange, which is fictitious.