Continuity mistake: In some shots (when the puppies run out the door & later out of the barn & also when just running in a pack), you can see that none of the puppies have black ears, yet many do.
Continuity mistake: When Roger & Anita fall into the pond, Anita only has a book in her hands. When she stands up from the water, she has a purse instead. (00:09:30)
Continuity mistake: The pups run up the steps. All but one (Rolly) reach the first landing. But, in the next shot, there are 3 other puppies still on the steps who jump up to the landing.
Continuity mistake: The spot that gave Patch his name is sometimes over his right eye and sometimes over his left.
Continuity mistake: Cruella pulls up next to the truck with the dogs in it. Next to the truck, you can see a hill going up. She then smashes her car into the truck & suddenly, the truck is on the edge of a cliff. A few shots later & you can see nothing but flat road behind them.
Continuity mistake: We see Anita walking Perdita. She's wearing a light brown outfit and hat. But, a few shots later, as we see her crossing the street to the park, her outfit and hat are much darker, and remains darker for the rest of the scene at the park. (00:05:40 - 00:08:10)
Continuity mistake: The thugs fall down the steps & land on the middle landing. You can see all of the steps & there are no puppies on them. In the next shot, all of the puppies are on the steps, just reaching the bottom.
Continuity mistake: Cruella throws the wine bottle into the fire. It explodes causing a big puff of smoke. The smoke clears & we see nothing in the air. In the next shot, shards of glass are flying through the air.
Continuity mistake: Cruella goes flying off a cliff & lands her car into a snow bank. Her car goes half way into the bank, covering her windshield completely. But, in a shot from inside the car, you can see there is no snow on her windshield at all.
Continuity mistake: Rolly stops on the steps & is all alone on the steps. He then starts to run up the second set of steps. In the next shot, you can see the entire set of steps, but Rolly is gone.
Continuity mistake: The puppies are watching a western on T.V. One of the puppies (Patch) is biting a rug. After he says the line, "He'll get that yellow livered.", the light brown ring on the outside of the rug changes to light blue.