Revealing mistake: On his way to be crowned, you can see the Pope's sneakers under his robe.
Episode #1.7 - S1-E7
Revealing mistake: When the guitarist punches the bass player in the face you can see him miss. (00:50:02)
Revealing mistake: In the second of two cases, a man who shot and killed his girlfriend is stopped by police. He is shown pointing his handgun out of the car window, but it is obvious that the barrel and recoil spring assembly of the gun have been removed. (00:41:03)