When Owen prepares the gun for Russian Roulette and rolls the cylinder, the single round rests at the bottom of the cylinder - this means the gun should have fired after 3-4 shots instead of 6.
Luther steps to the edge of the roof, with the toes of his shoes sticking over the edge. Moments later, without moving, his feet are completely back on the roof.
When the two policemen arrive at the tunnel, the blue light of the police car is turned on and then turned off when they stop and get out. Moments later the blue light is on again although the policemen did not enter the car again.
Luther said that the Army had left Owen Lynch high and dry; Royal Marines belong to the Royal Navy, not the British Army.
When Owen was filming himself he referred to Forty-Six Commando (a fictitious unit). No Royal Marine would say Forty-Six Commando; he would say Four Six Commando.
The Detective Superintendent referred to Owen as a 'Special Forces nut-job'. Royal Marines are not special forces.
When Owen was filming himself he said that his father, Terry, had been at Bluff Cove (Falklands War), but Terry's uniform does not bear the ribbon of the South Atlantic Medal, awarded for that conflict.
Luther describes Terry Lynch as a decorated veteran. Lynch's uniform shows two campaign ribbons and the Royal Navy/Royal Marines Long Service and Good Conduct Medal; these are not decorations (gallantry awards).