Revealing mistake: After robbing the DeCourceys Tommy Garret takes the keys from their Rolls Royce and throws them into the trees, but he actually doesn't throw anything at all.
Visible crew/equipment: After Garret and Nunn have robbed the DeCourceys the crew and lighting equipment are reflected in the side of the orange Porsche just before they drive off.
Continuity mistake: In the pre-title sequence when De Courcey's Rolls-Royce is being followed by the robbers' orange Porsche, the road starts off as a dual carriage way, then as soon as the Porsche overtakes the Rolls the road changes to a single carriage way, and then to a country lane .
Continuity mistake: During the last hold up, the shots inside and outside the blue Jag do not match up.
Answer: Scripted.