Continuity mistake: In the scene where Branch and his father are target shooting, right before Branch confronts his father about having Longmire's wife murdered, he takes out his ear plugs. Then when his father triggers the trap machine Branch turns his head and you see an ear plug in his ear.
Continuity mistake: Longmire is taping prisoner photos to the wall. When looking at the last photo, the tape is in the middle of the paper. When he puts it on the wall, the tape is on the right side of the paper. When the photo is in the background, the tape is on the left side.