Revealing mistake: When everyone first gets off the bus outside the hotel, Williams shakes hands with Margaret. If you look at his wrist you can see his real skin, not the prosthetic which is supposed to go nearly up to his elbow. It can be seen a little better in the next shot as well.
See No Evil (2006)
1 revealing mistake - chronological order
Directed by: Gregory Dark
Starring: Christina Vidal, Glenn Jacobs, Michael J. Pagan, Samantha Noble
Continuity mistake: The axe marks in the elevator doors that Jacob makes as he tries to escape, change appearance and some disappear and reappear.
Melissa: God, his hand. What happened?
Richie: You mean The Claw?
Tye: Leprosy.
Richie: I heard chihuahua attack.