In the scene where Nick Hume has burst into a gang members' flat and is forcing him to phone Billy Darley, look at the graffiti on the wall behind Darley when he's talking on the phone, it's the face from Saw, also directed by James Wan. See more...
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Continuity: When Kevin Bacon is buying the guns from John Goodman, he lays his red backpack containing his money on the counter. Bacon throws some money on the counter and, after receiving the weapons, walks away. When Goodman scoops up the money we can see Bacon's backpack still on the counter, but in the very next shot Bacon is several yards away with the backpack in his hands.