Revealing mistake: Throughout Series 2 Eve's reptilian hand is a glove made out of rubber and you can tell whenever she bends her wrist and the "skin" twists and wrinkles. An obvious example of this is in Episode 6 when she has finished going through "Accelerated Learning" and removes the listening device, bending her wrist and the glove in the process.
Episode #1.5 - S1-E5
Revealing mistake: When the automated forklift picks up Harvey and places him on a shelf you can see the wires of the harness he is attached to coming from behind each of his shoulders. (00:15:28)
Episode #1.5 - S1-E5
Revealing mistake: When the kids are climbing up the rubbish dump some waste food is dropped on them. There is a shot of Harvey as the food lands on him, and he accidentally hits the camera, shaking the shot. (00:03:16)
Episode #1.2 - S1-E2
Revealing mistake: Towards the end of the episode when Dinah, Lloyd and Harvey are walking to school you can see a man and a woman stood at the end of their driveway watching filming. (00:19:28)