In the fight scene between Tanner and Giles, the faces of the stunt doubles can be very clearly seen on more than one occasion. This is especially noticeable with the stuntman for Giles; Giles was clean-shaven, whereas his stunt double had noticeable facial hair.
When Nick is recuperating in bed after being mauled, the various scratches on his shoulders and chest are visible. But right after being mauled Nick's clothes were not shredded in the places where he had his scratches.