Other mistake: For the "true" ending to happen, you toss the dagger to Scully; this happens while you are held at gunpoint, with the knife that has to fly right past the enemy, who does not react or show any surprise or awareness in the movie clip that follows.
Other mistake: The suspect James Wong in international localizations of the game (Italian and Spanish that I could personally check) has two discordant dates of birth on the same official FBI file; one is 10/04/1948, the one and only in the English version, the second inside the body of the notes is 11/01/1950.