Continuity: There's no wrench in the front of the truck in one scene, but it appears in the next.
Revealing mistakes: When Gabriel steps through the doorway to exit the mobile home, and the door flings open by supernatural power, we can see the string at the top of the door that pulls it open.
Continuity: When Lucifer is holding Thomas from behind, the position of his hands changes between shots.
Continuity: When Simon takes Hawthorne's soul in the church, the flag draped over the casket changes positions from shot to shot.
Continuity: The injury on the bridge of Daggett's nose keeps changing size and shape.
Crew or equipment visible: When Walken opens the freezer door at the morgue, a crew member's movement is reflected in the shiny part of the handle.
Plot holes: Even though Thomas Dagett's writings are found at the scene of a possible homicide (that of Uziel at the hands of Simon), Detective Thomas Dagett is not named as a murder suspect in the subsequent murder investigation.
Revealing mistakes: As Thomas looks through Hawthorne's press clippings, a zoom-in shows that in the text of one of the articles, the word "preliminary" is spelled "perliminary".
Continuity: The red Ford pick-up truck has a winch on the front bumper in some scenes, in others it does not.