Visible crew/equipment: When a gremlin attacks the Mum from a Christmas tree, and the tree falls on top of her, you can clearly see a member of the crew with eyeglasses, wearing a red shirt, standing behind the tree pushing it forward on top of her. (00:54:30)
Visible crew/equipment: When Freddy falls over the banister onto the stairs near the end, notice the crash mat he lands on. (01:18:55)
Revealing mistake: Trish jumps out the window and lands face up on the ground. You can plainly see it's Kimberly Beck's stunt double. She looks nothing like her. (01:21:35)
Visible crew/equipment: When the two lead characters pull up to a stop in the car, the shot is dead-on from the driver's side, and you can clearly see the entire camera crew reflected in the side of the car. (00:30:10)
Continuity mistake: In the scene where Hector is talkin to Samantha and Regina in the radio station, just after they met, Hector is taking off his gloves. Then they switch over to the girls and when they switch back to Hector, his gloves are back on and he starts taking them off again.
Continuity mistake: Just before Melvin has sex with Sarah, Sarah's red dress straps fall down off of her shoulders, yet are back up in the next shot.
Revealing mistake: When Charlie sets the mens clothes on fire, burning gel is clearly visible on their clothes. (00:38:30)
Continuity mistake: When Daniel Stern takes Capt. Bosch down to the sewer area for the first time, the sweat, oil and dirt stains on his tank-top change constantly. This is most noticeable when they first descend into the cellar, where the shirt looks almost perfectly clean after being extremely dirty just a split second before as they start to climb down. Also, a little later, there's all of the sudden an enormous sweat stain on his chest that disappears later.
Plot hole: When Rachael/Ruby is attacked by Pluto in the rafters, Cass, being blind, is able to hear her cry out. When she does, Cass calls out to her by saying "Ruby." However it was a couple scenes later when Rachael tells everyone that she is really Ruby. Cass is surprised to hear this. Therefore, not knowing that Rachael was really Ruby, she should have called out "Rachael" instead of "Ruby" when she was attacked because she didn't know the truth by then.
Character mistake: The ref says there's no rules before McClure fights Whiplash but she tries stopping them later.
Plot hole: Billy's not tall enough to impale Linnea Quigley on deer antlers.
Suggested correction: The movie blatantly shows Billy lifting her high enough above his head to impale her. It's literally right there in the scene. Additionally Linnea Quigley talks about the making of the scene in the documentary "In Search of Darkness Part II," and talks about the actor living her high above his head over and over while making the scene.
Visible crew/equipment: When Terry's killing the nurse you can see the crew's reflection in the passenger side windows.
Continuity mistake: Towards the end of the movie, when Josh and Holly are trying to escape in the car, a mutant is on the roof and starts melting its hand through the windshield to get at Josh. The mutant is leaning over the windshield with its hand sticking through a hole it melted in the glass. In the next shot as they round a corner, the mutant is suddenly towards the back of the roof of the car, just holding on without attacking the windshield. In the next shot, the hole is gone also from the glass. (01:25:45)