Continuity mistake: When the butler takes the mother and kittens to be abandoned in the countryside he is on a motorcycle and sidecar combination. During the trip the sidecar changes from one side of the bike to the other and back again. Also, when the sidecar separates from the motorcycle when the dogs are chasing Edgar, the wheel on the sidecar switches sides regularly as well.
Continuity mistake: When Edgar is escorting George up the stairs, George's cane gets caught in Edgar's legs. However, in the very next shot, the cane is held high up in the air by George, when it should be still caught up in Edgar's legs. (00:04:56)
Continuity mistake: When the mouse gets in the light in the back of the motor cycle, there are little bits of glass sticking in from where a full glass cover had once been. But when they show the mouse bumping up and down there is no glass.
Continuity mistake: When the male kitten plays the piano for his singing sister the painting kitten starts to join him. His paws are covered in paint. During a brief scene change you can see that the colour of the paint on his left paw has changed. Also he only has two colours of paint on him, but minutes later the keyboard is covered in all colours of the rainbow.
Continuity mistake: When the cats get catnapped, Berlios's ribbon becomes undone as shown by the uneven length of the two ends. When he walks out of the stream, his ribbon is miraculously neat and tidy.
Continuity mistake: Edgar gets the seat bitten out of his trousers at least three times when being pursued by the dogs - it miraculously repairs itself.
Continuity mistake: When the butler gets placed into the trunk to Timbuktu, from the time he leaves the barn to the moment he gets lifted on the mail truck, a lock magically appears on the trunk.
Continuity mistake: When the lawyer is getting out of his car, he removes his driving gloves and holds them in his hand together with his briefcase. However, when he gets out of the car, the gloves are missing. (00:04:09)
Continuity mistake: The kittens fight and a candle falls on the floor. The candle is part of the moving parts against the fixed background (decor). In the following shot the candle has become part of the background and thus changes colour and shape. In the next shot when the cats walk away from the area where the candle fell, the candle has disappeared.
Continuity mistake: The painting kitten (in the beginning of the film) steps on a tube of blue paint and squirts a bit that ends up on the floor. Minutes later the colour of the blob on the floor has changed to red and a few moments later the paintblob on the floor has vanished. During the 'paint' scene several tubes near the palette also change colour and position.
Continuity mistake: When Edgard takes the cats to the countryside he looses his shoes in the struggle with the dogs. When he finally leaves the scene his shoes are back again.
Continuity mistake: Marie falls off the viaduct into the river but doesn't get washed along by the current at all (until they spot her and start the rescue that is).
Continuity mistake: During the song 'Thomas O'Malley', Thomas jumps on the tree and shakes one of the branches to make the petals fall on top of Duchess. Just before they hit the ground, a whole bunch of petals appear on the ground out of no where and some of the petals that were falling to the ground disappear once they hit the ground.
Continuity mistake: There is a name plate above the cat door that appears and disappears.
Continuity mistake: The small black cat first has blue eyes early in the film and then has light gray eyes further in the film.
Continuity mistake: When Georges enters Madame's room, the kittens' eyes can be seen all black, especially Toulouse's when the lawyer is dancing. A few scenes later, the kittens' eyes are back to normal.