Continuity mistake: The weather at the end changes. In the very wide shot snow can be seen falling on the distant hills. In the next shots there is no snow.
Other mistake: In the scene in 1987 which takes place where the movie did, the location of the case of money is different than it was in the film. In the film there were no power lines and it was on the opposite side of the road. The sun angle can be used as a reference. The film and this part of the episode were supposed to take place in the same spot.
Other mistake: When Lorne Malvo shoots out of the window the only thing sticking through the newspaper is the gun's barrel. When the shot changes to the scope view, you can see the outside. But you shouldn't be able to look outside.
Who Shaves the Barber? - S1-E7
Continuity mistake: When Molly visits Wes Wrench in the hospital we see the whiteboard on the wall has writing on it. Molly takes it off the wall and hands it to him without erasing it and it's suddenly blank.
Who Shaves the Barber? - S1-E7
Continuity mistake: When Gus arrives to visit Molly in the hospital, he brings her a bouquet of flowers. He sets the flowers on the roll-away table stationed over the end of the bed, and the blooms are facing towards the window. When the scene cuts to a different angle as he is walking toward Molly, the bouquet is now completely turned around and the stems are pointing at the window, even though Gus did not touch them again.
Who Shaves the Barber? - S1-E7
Factual error: The scene which supposedly takes place in Fargo was obviously not filmed there. Fargo does not have any skyscrapers that tall.
Continuity mistake: Lester's office assistant moves from behind him to almost in front of him during the scene where he hits the boys with a stapler. Notice Gina look over at her when she was just behind Lester.
Continuity mistake: When Greta sits down with the shotgun, it is pointing directly at Lou, horizontally angled. However, after a cut, the gun is suddenly pointing diagonally, at an angle. It is also strange that Lou, a former police officer, doesn't caution his novice granddaughter against pointing a loaded gun at him. (00:40:15)