Continuity mistake: When Levoi and Crowhorse visit Grandpa for the first time note the white and black beaded belt on the table behind Grandpa. In the beginning it hangs at the edge just at the first black stripe. Just after Grandpa trades Levoi for his glasses and hands him the rock, the belt now hangs nearly to the second black stripe. After that cut the belt now hangs in its original position.
Continuity mistake: When Levoi and Coutelle come upon the first G.O.O.N. roadblock the GOONs are emptying the contents from a station wagon. Note the two blue suitcases in the rear, first they are in the station wagon, then tossed open on the ground, then one is back in the station wagon again, while the second is no longer seen at all.
Continuity mistake: After the shootout at Maggie's house and her son is shot, Levoi carries the boy to his car. After he places him in the car, take note of the large circle shaped blood stain on the right side of Levoi's shirt, it is no longer there once they arrive at the clinic.
Visible crew/equipment: When Levoi is visiting Maggie and Grandma at their home he is seated at the table talking with Maggie and she brings him a stack of files. There is a framed drawing on the wall behind Maggie with an American flag in it, right before the scene ends you can see the boom mic reflected in the upper left of the glass.
Revealing mistake: In the scene when Crow Horse and Levoi are running from Coutelle and the "GOONS", they go off-road toward the stronghold. You can see in the grass the tire tracks from all the other takes. Especially as there is no reason any vehicle would leave the road at that place otherwise.