Episode #6.7 - S6-E7
Continuity mistake: During the petrol station fire, Hallam goes to rescue two attendants trapped in the station shop. The first external shot shows the inside of the shop on fire, but when it switches to the interior shot where Hallam tells them to run for it, there's no fire at all.
Episode #6.3 - S6-E3
Revealing mistake: Just before the runaway car crashes through the car park wall, you can see the pre-cut area where it crashes through.
Episode #6.7 - S6-E7
Continuity mistake: During the car chase scene, the car passes a petrol station and heads straight towards a bus. Then the next shot shows the car on a clear piece of road where the bus and petrol station have disappeared, but in the next shot the car swerves into the petrol station seen before. The car was going straight, without turning onto any side roads.