The Ones We Leave Behind - S1-E12
Revealing mistake: When Matt is running across the rooftops doing Parkour to keep up with the car he's following, there is a shot of him running towards another roof about to jump. In this shot, it's clear there is a stunt double in Charlie Cox's place. (00:29:27)
The Two Deaths of Jamie B. - S2-E4
Revealing mistake: When Naomi shows Kirsten the money, you can tell it's fake. Not only are the serial numbers all the same, you can read "this note is not real it is to be used for motion pictures."
Not Kansas - S3-E21
Revealing mistake: As the guy fires the machine gun at Guardian, there's a closeup of bullet casings falling to the ground, but they're not just empty casings, they're fired blank rounds.
We Will All Be Judged by the Courage of Our Hearts - S1-E8
Revealing mistake: When Nomi is on her bike, in a wide shot, she is portrayed by a stunt woman.
Revealing mistake: During the "power outage" when Brian is out on the street during the day, all the stop lights and cross walks are on - you can also see the lighting is on in the windows of office buildings.