Patzer

During the "Good Company" montage Jenny's house number is 1125 ("1125 5th Ave." as seen on Oliver's new tag). Right after the montage, as Jenny leaves for school, it is now 140 (as seen above the house door). Thirty seconds later, when Winston answers the door, it is 1125 again. In some shots the house number disappears altogether.

Georgette's hair is loose when she gets out of bed, but is in curlers when she looks in the mirror.

Dodger loses his red bandana when he steals the sausages.

Tito's bitten ear swaps sides when he is introducing himself to Georgette.

Near the beginning of the movie, when Oliver climbs out of the gutter during the rainstorm, the "Kitties Need Home" sign is visible in the close-up, but disappears in the wide shot. Also Oliver moves from near the curb to a few feet in on the sidewalk.

The Brooklyn Bridge does not have subway tracks.

During the chase scene, the tracks are electric and the Dobermans die from falling onto them. In reality, the trains in New York are powered by an electric third rail, not electric tracks.

In the kitchen scene, Jenny is seen mixing chocolate chips into the food she gives Oliver a few seconds later. Had she actually given him chocolate, he'd of gotten very sick. Chocolate contains two ingredients that are toxic in large quantities to cats and dogs: a chemical called theobromide and caffeine.

ice cream isn't particularly good for cats. Also, Jenny feeds Cocoa Krispies to Oliver in one scene. Chocolate is even more toxic to cats than it is to dogs, and even more chocolate to kittens than it is to full grown cats. When Fagin's dogs go to Jenny's house to find Oliver, Winston eats Georgette's chocolate, which is poisonous to dogs.

Even at the time this movie was made, Metropolitan Transit Authority (the company that runs the New York Subway) had strict protocol for when a train hits a car, such as when Sykes' car gets obliterated by the train toward the end. Even transit trains are mandated by federal regulations to apply emergency brakes and stop upon collision with a motor vehicle. The train that wipes out Sykes keeps on traveling.

At the end of the movie when Winston is supposedly blasted by the backfire of Fagin's motorcycle, he may appear to be clean just before revealing the dirt at the final scene. In truth he does get dirty, but the image is so small in the split second when Fagin took off that it is hard to catch without paying close attention. This could also only be presented in the DVD version.

At the end of the film, where Jennifer is hanging on the front of the car, she yells Fagan's name for help. Slightly later, Fagan yells for Jennifer to jump. The two never introduced themselves earlier in the film, yet know each other's names.

After Fagin reads the story to the gang, and Dodger is about to fall asleep, Oliver's tail jumps animation.

When Dodger jumped on top of the taxi at the ending scene, the "red" brake lights flash white. White indicates that a car is going in reverse, when the taxi is clearly going forward.

During the "Why Should I Worry?" scene, the grand piano that is being hoisted has no pedals on it.

Due to a different actress voicing her, Rita has an obvious change in her voice when she is singing "Streets of Gold". Normally, she speaks in a soft, gentle voice, and yet it sounds loud and rough when she sings.

When Dodger pulls the hot dogs underneath the table in the "Why Should I Worry" song, his lips don't move to match the lyrics and there is no muffling to represent the hot dogs in his mouth.

Tito's hair keeps changing from red to orange and back in different scenes.

During the chase scene, Dodger lets go of his kerchief that Roscoe was holding to make the Doberman electrocuted. But how did he get it back during the birthday sequence?