Revealing mistake: In the 'dead box' scene, just after Martin says 'you mean they're not new?', Sue White noticeably shifts slightly to the left before answering, and does so in a VERY unnatural manner. NOTE: although the show often uses time lapse editing, this is not one of those occasions. It is clear from watching the scene that it was two separate takes spliced together to appear as one shot, with the actors trying their best to replicate their positions from the previous take for continuity's sake.
Revealing mistake: When the ambulance is hanging over the cliff, in the wide shot you can see the cable holding the ambulance safe. (00:50:40)
