Continuity mistake: At the beginning when Big Bob and his family are first shown, at the gas station, their suburban has BF Goodrich all terrain tires mounted on chrome wagon wheel rims, after that first shot the tires and wheels change to Bridgestone Duelers on silver bullet hole wheels.
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.
Answer: Pluto puts his hand over Brenda's mouth and Ethel doesn't bother to look over.