Factual error: When the drug lord hands Malone the gun near the end to shoot the double-crosser, the hammer is cocked back. The drug lord then opens the cylinder and takes out all bullets but one. There are 2 mistakes here: 1) There are no revolvers that open up with the hammer cocked, to avoid accidental firing. They all stay locked shut until the hammer is put back down. 2) The bullet is in the wrong position to be fired next, yet it fires on the first attempt. It should be in the first position to the right (one o'clock) from the hammer.
Factual error: ML is caught by the LAPD without the diamond which was obviously never found. Fine, the site is huge and they may have thought the accomplice took it. However, its inconceivable that the insurance company and the police would not keep surveillance on him after a $17MM diamond was missing for 2 years. They should have been on him like a hawk.