In the Public Interest - S14-E3
Audio problem: There's a scene where Frost and George are in the car. Frost's phone rings and you can hear both the ring tone and sounds of the phone vibrating against a surface. The problem is that when George is holding the phone in his hand it is still making very loud vibrating sounds, like it would if it was still lying on a surface. When you hold a vibrating phone in your hand it doesn't make noises like that.
Audio problem: At the end of the first flashback, Stromwell's car is shaking long before the engine revs. (00:05:40)