When Heather takes out her gun to confront the intruder, she inserts a presumably full clip into the automatic. However, when she fires the gun, only a couple of rounds, the slide locks open on an empty clip. She should have had a minimum of 7 rounds before the slide would lock open.
The admission made by the criminal would not hold up since it was coerced, regardless whether the bomb was fake or real.
The Character Error item about Ducky and pineapple is only half right. Dr. Mallard does not say pepsin, he says pectin, which is a thickening agent used most often with fruit (marmalade, etc.)
Several individuals pronounce the area of McLean, Virginia as Mc Clean (like the opposite of dirty) where as anyone from the area knows that is is pronounced "Mc Lane" (like lane, as in a path)
Ducky tells Jimmy about his memory of a criminal who removed his own fingerprints by soaking his fingers in pineapple juice. He erroneously says that the pineapple juice is pepsin. In reality, pepsin is an enzyme produced in the stomach. The pineapple enzyme is called bromelain, and the papaya enzyme is papain.
When entering Abby's user name and password in her computer, Tony types her last name as "Scuito" instead of "Sciuto".