Continuity: When Jim puts the puppy, Lady, in her basket, he puts down some paper on the floor. A few shots later, the paper disappears.
Continuity: When Trusty and Jock come over to cheer Lady up, she has her head on the ground in dismay. There is one shot where she suddenly has light brown spots around her eyes. At all other times, there is only a light brown spot that goes from her forehead to her nose.
Continuity: Trusty's nose changes from black to brown for a second and back again while recollecting about Ol' Reliable to Jock and Lady.
Continuity: Lady's collar changes from blue to tan When jock and Trusty find her outside after she thinks she has done wrong causing Darling to smack her for taking the yarn.
Continuity: After ''We are Siamese'', when Lady is chasing the two cats, the cats knock down blueish colored curtains which tangle up Lady. After Aunt Sarah comes into the room, Lady is tangled up in red curtains.
Continuity: The dates on the calendar during the pregnancy montage do not match from month to month.
Continuity: As the Siamese cats are pulling on the mantle to get at the fishbowl, in one shot the pattern on the mantle does not advance as it is being pulled.
Continuity: Jim Dear puts a chair in front of the cellar door to keep the young Lady from escaping. When Lady looks under the door, there is no sign of the chair, but it is there in the next shot. Later, when Jim tells Lady to go to sleep, the shadow of his legs is seen coming from underneath the door, but there is no shadow of the chair's legs.
Audio/visual unsynchronized: The shadow under the door extends too far. The light source would have to be on the floor to cast a long shadow.
Continuity: In a scene where Lady is at the bottom of the staircase, on her way up, there is a mirror to her left. You see her reflection as she is about to start up the stairs, then the reflection disappears before she moves.
Continuity: Right before Tramp chases the rat into the house, he's out in the rain and is wet. In the next shot, he's dry.
Continuity: Trusty gets injured from the wagon around April or May as revealed that the baby was born in April but yet around Christmas he still has a broken leg. After 8 to 7 months Trusty should have fully recovered.
Continuity: Tramp's color changes from brown/tan to dark-gray/gray. In his first appearance at the rail yard, he is clearly a brown dog with tan belly. By the end of the movie, he is a dark gray dog with a gray underbelly. He switches back and forth a couple of times during the film.