When Jake is telling his version of the shoot out, he opens the cylinder of the revolver and it shows a spent shell, he then aligns it with the barrel and then cocks the pistol which would move the shell to the next spot, missing it totally. He then fires a round which would not happen.
During shootout, Jake opens revolver cylinder. There is only 1 shell in cylinder. The empties that Becker fired would be in there too.
Guy's accent comes and goes as he gets agitated/emotional.