Single Point of Failure - S1-E2
Revealing mistake: Walter accesses code on the sick girl's laptop to trace the source of the virus - aside from the fact that the code comes straight up a fraction of a second after his hands even touch the keyboard, the code displayed in the black window is for a set of traffic lights, with lines like "Walk/Dont_Walk" and "Green_Arrow/Yellow_Slow." (00:08:10)
Revealing mistake: When Ralph is talking to the Special Forces Unit, the spectrogram at the bottom of the screen does not match the voices from any characters or the gunshots.
Answer: A propeller sucks in from one side and pushes away from the other side.