Revealing mistake: There is a large cut on the glass window prior to Liotta smashing it, to make it easier to break. The scratch was not there in the previous shots of them leaving the car. (01:03:05 - 01:28:50)
Revealing mistake: When Tellis enters some names in the computer, one of the fields is for "KNOWN ALIASES". However, possibly due to the fact that the software was written for the film and not checked thoroughly, the field is shown as "KNOWN ALAISES". (00:47:30)
Revealing mistake: When Mike is shooting himself, he is aiming with the gun at least 2 inches over his head.