In the first scene on the canal boat, the farmhouse in the background behind Jeremy suddenly reappears after disappearing behind his back as the boat turns left, then disappears again the next time the camera cuts to him. At the same time the background behind Mark changes back to where they were a few moments before.
Whilst explaining to Mark about the death of 'Mummy' Jeremy remarks 'The clutch on that thing!' However when he runs over 'Mummy' you can clearly see that Jeremy is selecting a gear with an automatic gearbox hence the car would have no operational clutch.
In the scene with the Range Rover, Aurora says it's a diesel. However this particular car has a 4.2 liter supercharged petrol engine (according to the DVLA record for its numberplate registration).