Continuity mistake: When Doug is walking across the desert, soon before he and Bob leave for help, he walks into shot with Brenda in the background laying back on her lounger and the bottle of lotion is lying on the ground beside her. In the next closeup the bottle of lotion is suddenly standing upright, beside her lounger. (00:23:40)
Continuity mistake: When Doug goes to rescue his baby daughter from the kidnapper's bed, he creeps past the living room to see a bald matron watching TV and combing a wig. Then after he grabs his baby, and creeps past the living room, the bald matron is still sitting and combing the wig. But 5-seconds later, when he gets a few feet down the same hallway, that matron suddenly appears out of nowhere and attacks him.
Continuity mistake: In the shot where Doug's fingers are cut off, the severed finger that remains on the floor is covered in blood, but next shot of him pulling his hand away shows almost no blood on the severed finger.
Continuity mistake: The scene where the father has gone back to the gas station to look for help, he purchases a bottle of water and pays for it. He takes a sip and walks into the back. He puts the bottle down on the table, and the bottle is now half empty.
Continuity mistake: In the scene where Doug is standing by the generator and finds his baby, he hides from Cyst against the house's wall as Cyst passes, dragging a corpse. After Cyst passes, Beast whines which makes Cyst turn. In that split-second, Doug and Beast manage to get inside the rusty car a couple of feet away.
Continuity mistake: Bobby's boxer shorts go from blue in the beginning of the movie to black towards the end.