Revealing mistake: In the opening scene where the zombie kills Johnny. When they fall against the tombstone you can tell it is a dummy.
Visible crew/equipment: When Ben first arrives at the house, a zombie tries to get in through a door in the kitchen. Ben fights it off and tries to push it out the door. Initially, when he first closes the door on the zombie, the relfection of the cameraman is seen as clear as day in the window of the door.
Continuity mistake: When Cooper goes upstairs to get the TV set, in the room, the power cord hangs a little bit. Next shot, in the hallway, the same cord is on the TV set, not hanging at all. And in the next shot, when going down the stair, he holds the cord in his hand. (00:57:00)
Visible crew/equipment: When Ben runs over the zombie as he approaches the house with his truck, if you watch closely you can see the wires attached to the dummy prop that were making it stand up suddenly whip upward. It is actually much easier to see while the film is running at full speed, rather than pause or slow motion.
Continuity mistake: After Ben arrives, he goes outside to exterminate zombies who have been attracted to the house. There were three, the one he hit with his truck, the one on the porch, and one in the yard that looked to be wearing a leather jacket. He kills the one on the porch and the one in the yard, but he doesn't kill the one in the jacket. After he kills the one he hit with the truck and begins to walk back up the hill to Barbara, you can see him in a full, empty yard. The third zombie seemed to have disappeared.
Factual error: Barbara has blood drip on her in the first scene when she enters the house. Later that night, Ben starts upstairs but Barbara stops him and points to the blood dripping from the ceiling... the blood would have dried and clotted in the time that it first dripped on Barbara and the time that Ben Starts upstairs.
Continuity mistake: After the sequence where Ben tells Barbara she is losing it and then comforts Judy Rose, we see Barbara reloading a shotgun and Ben in the background nailing a white door in the next room. After it cuts to a shot of Judy and Tom nailing another door, we see Ben knock over a table while holding and putting in place the same door he had previously been nailing the window shut with. (00:53:30)