Character mistake: Throughout season 3, whenever someone visits Henry in prison, the word "VISITOR" on their visitor tags is misspelled as "VISTOR."
Revealing mistake: Early in the episode the dead body in the barn ever so briefly flutters his eyelids.
In the Pines - S3-E4
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. (00:59:55)
Factual error: Several times firearms registration is mentioned, but Wyoming has basically no gun laws. No registration is required, and no concealed carry permits are required.
Continuity mistake: Walt is with Cassie Linder in her family's barn while she tries to get a tractor running. It is dark outside, and before dawn. They talk for a little over a minute of screen time. When Cassie finally gets the tractor up and running and rides out of the barn, it is a bright sunrise.
Visible crew/equipment: When Dawn Linder pulls up in her car with her daughter Cassie, several crew members are reflected in the side of the car as Walt and Vic approach it.
Continuity mistake: After Lucian jumps off the edge and Walt turns him over, Lucian has dirt on the side of his head by the blood. In some shots the dirt is gone, but then back in later shots.
Continuity mistake: When Walt is talking to the Denver detective, he opens the door to go inside and then the detective says they found the man who killed Walt's wife. Walt stands there, holding the door open still. When the camera angle changes, he's no longer holding the door open and goes to open the door again.
Continuity mistake: Walt and Vic are in the compost heap digging around. Vic is without gloves while digging and when drinking the offered drink. She then resumes digging around with rubber gloves suddenly on her hands.
Revealing mistake: The man in the motorised wheelchair that Vic talks to is holding an ice cream cone that his dog is licking. It is a fake ice cream cone - none of the ice cream disappears when the dog licks it.
Factual error: You cannot remove a kidney laparoscopically. The wounds were way too small.
Continuity mistake: When Branch hugs Cady, he places his right arm over her left shoulder, but in the following shot his arm is suddenly around her left arm/elbow.
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.
In the Pines - S3-E4
Visible crew/equipment: When Ferg is looking at the black notebook, you can see the hand of the stage crew holding it in front of his face. (00:08:55)
Unquiet Mind - S2-E1
Character mistake: When Walt is coming up to Mars cabin he hears a gun shot, he then re cocks his gun ejecting a live round, since he has not yet fired it. (00:20:30)
Goodbye Is Always Implied - S6-E10
Continuity mistake: Near the end, when Vic is on the porch bench, she's holding a mug in her hand. When Walt goes to sit down, she's still holding it, but in the next shot her hands are empty and the mug is on the porch railing.
Continuity mistake: Walt shows up to the first crime scene after visiting his daughter. He and Vic begin to discuss the girl. In the first shot of the girl, she is facing the camera and has her eyes closed. The very next shot of her, her head has moved and her eyes are open.
Continuity mistake: After Henry opens his safe and stands up the two toy soldiers, one of them is suddenly on its side despite Henry never touching it again.
Continuity mistake: When Walt and Vic are driving during the day, the sun changes constantly when the shot angle changes from each character.
No Greater Character Endorsement - S6-E6
Continuity mistake: At the tribal council hearing, when they vote to oppose, 7 of the 8 raise their right hand (the man at the end raises his left hand). But in the close up panning shot of the raised hands, the guy sitting next to Jacob Nighthorse has his left hand raised. It's back to his right hand when they lower their hands.
Answer: Chance.