Continuity mistake: When puppy Lady stands on the rug demanding to go upstairs, she stands on the right side of the rug. When the shot changes she's standing on the center part.
Continuity mistake: When Jim shows puppy Lady her basket, a pillow suddenly appears between shots.
Factual error: At the end of the movie, Lady has four puppies, three Spaniels, like her, and one mixed breed, like Tramp. Realistically, they would all be mixed breed with characteristics from both parents.
Continuity mistake: When Tony and the chef are serenading Lady and Tramp during the Bella Notte spaghetti scene, the amount of spaghetti on the plate changes between shots.
Continuity mistake: When Tramp is looking at the puppies in the pet shop window, you can see there is a bowl at the back, but when the camera angle changes in the next shot, the bowl is now at the front.
Continuity mistake: When Tramp finds Lady tied up with a muzzle, its long strap jumps to a different position on the ground. First it's situated at Lady's side, but then it's out in front of her moments later.
Continuity mistake: After Tramp fights off some stray dogs in a back alley, we see him standing adjacent to a wooden fence. The next angle shows him near some barrels, trash and wagon wheels instead of a fence.
Continuity mistake: As Tramp shouts "log puller," the beaver works his way through a fallen tree and makes quite a gouge in it. But moments later when the beaver tries removing Lady's muzzle, the gouge disappears altogether.
Continuity mistake: When Lady and Tramp are walking through the zoo trying to find something that will remove her muzzle, they approach an alligator's cage to see if he'll help out. Lady and Tramp are standing in between a couple of steel bars at first, but in the next shot a bar appears between them instead.