Deliberate mistake: In the facial morph, the faces don't come anywhere close. The face was morphed with no feature of either resembling the other. The only matching features were the hair and neck which were not touched by the morph. The midpoint of the shift wreaks of Photoshop-like effects (softening of the face alone). (00:41:50)
Deliberate mistake: The floating contact mine that explodes at the end of the movie would never have been put in an evidence room in a police station. Barring that error for the plot's sake, FCMs weigh 450lbs and would have required a hydraulic crane and a cart to move it, not just a couple of guys. They also did not contain clocks. (00:42:40)
Deliberate mistake: When Willy's fellow prosecutor, Norman, dropped the Crawford preliminary hearing on him, they said it started at 15:00. Willy is in a rush and the whole ordeal takes him just a few minutes. Still, when Nunally accosts him in the parking lot, the movie sped things up; it's nighttime. (00:27:00)