I've read that Robert McCall was actually David Callan ~ Mr Woodward's emotionally tortured government agent / killer for hire in the British TV series of the same name ~ and I really don't agree with Russell Crowe playing Robert McCall. I can't see Russell Crowe delivering a line like the one below like Mr Woodward did:
[Interrogating an unco-operative baddie] "You have five seconds to give us the name. [pause] Time's up! Throw him out of the window!"