Revealing mistake: When Brad Renfro is standing outside Reggie Love's house, hitch-hiking, he is laughing so hard he has to turn away from the camera, and even then he is still visibly shaking with laughter.
Revealing mistake: When Barry goes running after Reggie during the boathouse scene, he tackles her and loses his gun when he does. A suppressed Walther PPK. He drops the gun on the ground which causes the suppressor to fall off it. In reality, this wouldn't happen as the suppressor is threaded onto the barrel of the pistol. A simple drop onto soft ground (grass and leafs in this case) wouldn't cause it to fall off.
Revealing mistake: Romy is seen reinserting the white handkerchief into the car tailpipe a couple times without burning his hands. The pipe gets hotter as the car is running, and the cloth stays white the whole time, even though it's in a dirty exhaust pipe.