The Order (2003)

Continuity mistake: When Thomas follows the demon who is taunting him down in the sewers, there is a shot of him with a cut and blood on his face/nose. The camera changes to the demon and then back to Thomas, and the cut and blood are gone. Later, in the hospital, he has the cut back on his nose.

Bookstore Owner: And sometimes when you look into the abyss... the abyss looks back into you.