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)
Visible crew/equipment: The crash mat is visible when Michael Myers falls off the balcony in the beginning of the movie.
Other mistake: When the two Americans are walking on the moors, their shadows are always in front of them, despite them having changed direction numerous times. Additionally, with the moon always being behind them, how are their faces being lit?
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: When the two station reporters are showing Eddie's drawings to George Waggner, the drawings change position on the desk between shots. (00:16:00)
Visible crew/equipment: When the woman in the opening credits is taking off her clothes, she is about to take a blue shirt from her bag, but decided against it. As she does, you can see a crew member aimlessly wandering around in the bushes behind her. (00:01:40)
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: 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: 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.
Visible crew/equipment: When Dr. Boyle arrives in Boston, you can see the reflection of some crew members on the car.
Continuity mistake: In the raft scene the boy at the front right, from his view, is kneeling on his left leg. When the camera cuts behind them he's suddenly kneeling on his right leg and remains on this leg through every other angle.
Revealing mistake: When Joe has died of blood poisoning there is a close up of his head and neck, you can see him breathing and his eyes flicker.
Visible crew/equipment: When Michael Caine leaves the Last Chance Saloon at night and is walking along a sidewalk in town, he looks inside one of the store windows to see something moving under an old cloth. As he looks closer to the window, suddenly a hand jumps out from under the cloth and crashes through the store front window from the inside and grabs Michael Caine's throat. What is so laughable is that the crew or extra who is putting his hand through the breakable glass to get at Michael Caine's throat fails to "hide" his entire arm from view and what is supposed to be a severed hand is not only the hand but the entire arm attached.
Continuity mistake: At the end when Axel hits TG as he's coming round the corner, the head lamp TG is wearing is on or off depending on the angle of the camera.
Revealing mistake: When John Jaffrey is lying dead in front of his medicine cabinet, he is still breathing.
Continuity mistake: When we see Susan and her friend David laughing, Harold's at the closed window. When Susan comes back into the room the window's open.
Plot hole: After the first murder in Pam's dorm room there should be blood everywhere but when Pam returns to change her dress there is only a single stripe of it on the bedsheets.