When Ray and Mitch are talking about seeing Eddie Lomax, Ray says that he is a private investigator in Little Rock. But it plain by the meeting between Eddie and Mitch, that Lomax is in Memphis, not Little Rock.
Mitch is told by Mulholland they were billed 33hrs. Back at the office on the PC - if you add up the hours for the month of Dec/92, it totals 37.9hrs. You are then shown his time manually added up to be 28hrs then the actual bill is for 33hrs. Further if you look on the bill for Dec 22, the amount was 6.1hrs yet the PC shows only 5.1 hrs.
When Mitch stands near the alcove to the Morolto's hotel room, a tall vase on a table is near the molding of the entrance. When Mitch enters the room to confront the brothers, the vase is closer to the center.
Memphis is on the EAST side of the Mississippi River. Boston is NORTHEAST, so the Mississippi River would be on the left. Instead, in the closing scene, Mitch drives SOUTH with the Mississippi on the right. Perhaps they decided to open a law firm in Atlanta, instead.
The cars of the Mud Island monorail leave and arrive at opposite ends at the same time. It would be impossible for the man following McDeere to leave his car and begin running for the other side before McDeere left his car.
When Mrs. McDeere goes to the Cayman Island and agrees to sit with Avery, Avery orders two Havana Club from a waitress who he addresses by name . The waitress responds; "Okay Mr. Taylor" or "Right away Mr. Taylor. Was this misquoting of his name intentional perhaps to show he is of no importance to her or is it a goof by the actress playing the waitress?
After visiting his brother, Ray, in prison, Mitch McDeere tells his wife that he had visited him. At that point in time, Mitch's residence was bugged, which would have meant that William Devasher would have known about Mitch's brother being in prison. Yet later, William Devasher learns about the fact from a prison guard.
In two shots it is suggested that the albino thug is sent from Memphis to Grand Cayman to stop Abby McDeere. In one he is seen to run towards the waiting plane, and in the other he is seen deplaning in Grand Cayman for a cab.
A few moments later he is back in Memphis to chase Mitch McDeere after he ran from the office.
When Mitch is talking to the man from the justice department on the bench by the reflecting pool, you can see the Washington Monument and the Jefferson memorial in the background. The Jefferson Memorial is on the wrong side indicating the shot is reversed.
The goof items below may give away important plot points.
Incorrectly regarded as goofs
When Agent Tarrance asks Mitch how he came up with mail fraud as a way of getting the firm, he says it was on the bar exam. He clearly got the idea in an earlier scene, when one of his clients complained about being overbilled, however, the fact that he knew it was illegal to mail the inaccurate documents to their clients likely could have been a question on the bar exam.
Eddie Lomax's secretary was under the desk when Eddie was shot. She never saw the killers because she was totally enclosed and hidden. Yet in a later scene with Mitch, she says she saw the killers and describes them, even the color of the albino's eyes!