At the beginning of the film, Joey is beaten up, leaving his right arm injured and immobilized. But, when he reaches the rooftop, running away from one of the men who beat him, he crosses a sort of bridge leaning on his right arm while having his left arm immobilized. After this frame, he switches back to "normal".
On two occasions, in the police radio 'voiceover', Joey Jones is referred to as long-term missing from the 'Defence Department'. There's no such thing in the UK-it's always referred to as the MInistry of Defence.
As a British serviceman, Joey Smith would never had been referred to as having served in 'Special Forces', as the term is unused. Instead, the particular unit would be referred to: (Royal Marine) Commando, SAS (Special Air Service Regiment),SRR (Special Reconnaisance Regiment) or SBS (Special Boat Service Squadron). The term 'Special Forces' is American.