Audio problem: In the dream-café Cobb talks to Ariadne right before telling her that it's all a dream, but from a side angle the mouth doesn't match the sound coming out, which obviously belongs to the front angles.
Audio problem: When the news helicopter descends on the house as the news of the ICC trial breaks on the TV, the helicopter rotor makes no sound or almost no sound until the shot changes to see it, despite it being very loud once it is visible. The sound of its blades also fades very quickly as it leaves, despite any pilot presumably being very careful so close to a building.
Audio problem: Hoffman sets fire to the Jigsaw evidence with a Zippo lighter. You hear him open the lighter and set fire to the petrol. He then leaves the lighter. But you hear the lighter click shut again. (01:17:40)
Audio problem: When Niko is going to get the key for somewhere for Zoe to hide and then Zoe disappears he says "Zoe"? When he says it his mouth does not move but once he finishes saying it that's when his mouth moves.