Ground Zero - S4-E6
Audio problem: When Greene is outside by the river explaining what happened to him, there are a couple of really bad sound edits in the background noise. These are really obvious as the sound suddenly changes, and for some reason the background noise in this scene is very loud, almost as loud as the dialogue; very strange.
The Accident - S1-E1
Audio problem: After school when Alex and Ray are walking the camera is far away but you can see that the sound of the person that is talking is different than who is seen talking.
Audio problem: In the last scene of the episode Sheridan says to Mr. Sebastian "The morning after the last of a string of murders in the East End." His lips however, say West End instead of East End. The script and initial broadcast used the words East End, but after it was pointed out that this was factually incorrect, the line was dubbed over for all subsequent broadcasts and releases. (00:38:50)