Continuity mistake: In series 1 episode 10 (Last Rites) when Oz asks Bomber if he is interested in his porn deal, just before Bomber gets his foot broken, he tells Oz he has five kids. In series 3 episode 5, Bomber tells Lainie (the native American girl) when she asks if he has any family, that he has four children. Is not likely that any of the kids have died as he has just told her his wife had died and would probably have mentioned the loss of a child as well.
Plot hole: In the first series, Bomber mentions 'City's my team', referring to Bristol City, and dislikes the other Bristol based football club (Rovers). If this is the case, why is he wearing the distictive blue-and-white quartered shirt of Bristol Rovers in series 4? I know that people change allegiances, but it's very unlikely.