Continuity mistake: When the nuns are complaining to Gilbert Gottfried about Junior, the head nun's wart above her eye changes color throughout the scene. It varies from light in colour to dark in colour several times.
Audio problem: When Junior picks up the cat and it starts to hiss you can see that the cat's mouth isn't moving.
Continuity mistake: When the nuns are arguing with Gilbert Gottfried, at the beginning of the scene there is no bell on the nun's desk, but when Junior is standing by the desk the bell is suddenly there.
Factual error: When John Ritter and his wife are sitting with the fertility expert, the doctor explains how her reproductive system is not functional. The manner in which he explains this would lead us to believe that she would have been physically unable to menstruate, thus she would have known long before this meeting that she was incapable of bearing a child.
Continuity mistake: At the end of the movie, a car goes off a ramp and is turned upside down. After Jr.'s dad gets shot, watch the tire. It is spinning and a few seconds later it isn't turning anymore. A few seconds later it's turning again.
Visible crew/equipment: Just after junior puts out the campfire by peeing on it, you can see a man in black standing/crouching behind the tent on the right. (00:37:40)
Suggested correction: That is not a man, it was one of Roy's kids running off and staying away.
Continuity mistake: When Jr. is driving with John Ritter on the top of the car, just before they go through the store windows, the cars in the parking lot change significantly from different angles. In one shot a pickup truck is backing out which would block them, but it is gone in the next shot.
Revealing mistake: When the car crashes into the tall display of tennis balls in the store, there's a dummy on top of the car dressed up in the same clothing as Ben.
Continuity mistake: In the dining room scene at the nunnery, just after the meatball falls from the ceiling to land on the sister, Junior has his hands in front of his face laughing. In the very next shot Junior's hands are down at his side.
Continuity mistake: After Junior's first night at the home, John Ritter tells Junior they're going camping and Junior says he'd rather be watching cartoons. When Junior is speaking his left arm is up behind his head. In the next shot from behind Junior when John Ritter approaches him, the boy's arm is down at his side.
Visible crew/equipment: As the car is entering the store through the front glass there is a shot with a reflection of the car. Rigging can be seen on the vehicle, and it looks to be a different type of vehicle all together than what we see in the next shot.
Character mistake: Big Ben is loaded feet first into the ambulance, he should've been loaded head first.
