At the plastic surgeon's office, Quincy asks the receptionist a question and she places her left hand and finger on her face as she thinks. In the next shot, over her shoulder, her hand is flat on the desk.
When Quincy pulls Legget's robe aside to reveal the incriminating seat belt bruise, the bruise is across Legget's right clavicle. Shoulder belts cross the chest diagonally from the left clavicle to the right side of the waist.
Quincy walks into the firing range without any ear protection while Monahan is firing his gun (wearing ear protection )and didn't suffer any effects of tinnitus. This would have been impossible due to the extremely loud sound of the exploding ammunition.
When they pull the car out of the water, the inside is completely dry and clean.
Quincy walks into the gun range where Monahan is shooting what is clearly a .38 revolver. However, there are 7 shots fired according to the sounds.