Other mistake: They have a great electric fence, but the power goes out because of the storm. They all panic and flee the house, but the lights are still on in the house.
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.
Other mistake: When Voight finishes talking with Rev, Voight walks away. When he does, he goes in the opposite direction from where his car is parked and on the wrong side of car for a driver. (00:27:05)
Other mistake: Dr. Wade is the ME for Jefferson Parish. Most of the victims are found in Orleans Parish. Not her jurisdiction.
Cold Murdering Bastards - S3-E2
Other mistake: When we see the Royal Gazette, with the misinformation about Washington's death, the 2nd column is repeated in the 4th column.
Things You Can't Outrun - S1-E3
Other mistake: When Cisco and Cailtin call Barry to tell him about the man with the gun, Cailtin says he has a gun. Cut to the cops pursuing him, the perp shoots at the cops, and one of them seems surprised that he has a gun. There's no way Caitlin could have known about the gun without the cop knowing (which would presumably have been relayed over police communications).
Episode #8.5 - S8-E5
Other mistake: We are told several times that the "Special Reserve" is kept locked in Mr. Palmer's office. When Anna comes to the bar to "see" it (and put the poison in it), it is in plain sight on the shelf behind the bar, and her husband hands it to her.
Other mistake: While Gordon is a security guard, he has sergeant stripes on his sleeves but corporal stripes on his collar of his uniform.
Other mistake: When Happy goes to see if the backhoe will work to finish freezing the water she says the hoses are damaged. The hoses she indicates as damaged are the ac lines and hydraulic lines that hydraulic oil flows through - she does not even look at the water hoses. (00:18:40)
Other mistake: During the transition scene after they're talking about the O'Shea video coming out and before Jerry is at the crime lab, there's a shot of traffic at night. But the film is ran backwards. All the cars are moving in reverse.
Other mistake: In first episode Wells apologizes for locking up Clarke's dad, then acts surprised when she tells him he got executed, when in episode 3 it's revealed they both assisted in the execution.