Goofs

When Junior drives the family car into the glass at Big Ben's, just before he gets to the glass, a pickup truck backs out in front of the Healy family car. It conveniently disappears and is forgotten mere seconds later.

When he falls off the trapeze, the Bow Tie Killer falls into a tiger cage that was not down there before. In fact, just mere seconds later, Junior slides down the rope below the trapeze poles, into his father's arms.

One scene Junior goes to the bathroom on the campfire and puts it out. The very next scene the fire is lit.

When the Bow Tie Killer escapes from the convenience store/gas station, he doesn't take the Smiley Pies box with him. Yet it's there in his car in the scenes when Junior rides with him.

All throughout the movie, Junior has all his baby teeth, and longer hair, and then looks a little older with shorter hair and a large top front tooth growing in. This happens within scenes, beginning in the orphanage.

In the end credits for the song "It's My Party," Lesley Gore's first name is misspelled as "Leslie."

Sorry, but no possible way Flo could be in that suitcase and alive at the same time.

When Junior crashes the car into the glass enclosure, while Ben is on the roof of the car, it's obvious that John Ritter has been switched out for a dummy, as evidenced by the stillness of the body, as the hundreds of tennis balls crash down on him.

At the circus toward the end of the movie, when Junior gets flipped on the trapeze, Junior's "adult sized" stunt double is very obvious.

Obvious fake cat when the cat jumps on the Grandfather and his Grandfather falls down the stairs.

On the 2017 Blu-ray release of the film, following the credits role, the ratings bumper claims that the film is rated PG-13. Yet the package and the disc state the rating is PG.

During the scene where Junior swings the nun out of the window (beginning of movie), her lips do not sync up with what she is yelling.

When Junior picks up the cat and it starts to hiss you can see that the cat's mouth isn't moving.

Camera shadows in some scenes of the final chase.

Reflected on the Daihatsu that Junior attempts to drive.

As the car is entering the store through the front glass, there is a shot with a reflection of the car. Camera 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.

At 54 minutes when Junior slides into home plate the string pulling him is clearly seen.

When Junior sends Martin a letter in prison saying he's getting out of the orphanage, he didn't know at the time that he was getting adopted by the Healys and Martin had escaped from prison the day Junior went home with the Healys. Martin could not have known where the Healys were living, or that Junior was staying there.

Junior makes it a point to discuss how he had to clean pots and pans on his birthday, shortly before he is adopted by the Healys. However, he lives with them for about three to four weeks at most, before he tells Martin that his next birthday is in a couple of weeks. There is no way an entire year has passed.