Continuity mistake: When Cheryl is running through the woods, she is wearing slippers that stay on up until she reaches the cabin door. However, in following shots, she is shown barefoot, and when Ash opens the door her foot is dirty as if she'd been running barefoot the whole time. (00:28:05 - 00:29:10)
Continuity mistake: When Michael enters the Elrods' home and steals the knife, as he picks up the knife from where Mrs. Elrod had left it, there are several drops of blood that fall onto the lunchmeat, presumably from Michael's injuries from having been shot. A few seconds later when Mrs. Elrod walks back over to the lunchmeat and reaches for the knife and sees the blood, the droplet patterns are different.
Continuity mistake: When Mommie is cutting Christina's hair it keeps on changing from long to short several times.
Continuity mistake: When Scott gets his throat cut, blood pours out. Yet when Terri spins him around, there's no blood anywhere on him except a small amount on his shirt sleeves.
Continuity mistake: In the first two Omen movies, Damien's mark of the Beast was hidden on the top of his scalp. In this movie, it's behind his right ear.
Continuity mistake: In the head exploding scene the table gets covered in blood and brain matter, but in the next shot the table is clean. (00:13:05)
Continuity mistake: When Katya and the Mayor enter his study and sit down, in one shot Katya puts her hand up to under her mouth. In the next closeup it is down. (00:18:50)
Continuity mistake: A zombie smashes a window, and then we see its hands trying to get in. One woman grabs a machete from the table and then proceeds the cut both its hands off. The amount of glass on the window-ledge below the zombie's hands differs, depending on the shot.
Continuity mistake: After the 'game' of flying over the drawbridge in cars, Ginny runs away into the forest with just her scarf. In the forest she has her scarf and handbag.
Continuity mistake: At the end of the movie when Pam returns to her dorm room she heads to the bathroom for the final surprise. When she walks towards the bathroom door you can see the door is only slightly ajar, however when the shot changes to inside the bathroom the door is now almost fully open (open enough to see Pam fully).