Continuity: As the crate with Edgar in it slides through the barn door, the padlock suddenly appears on its latch.
Continuity: During the country dogs chase, Napoleon bites a hole in Edgar's pants, which are intact moments later. He bites them again at the mill, but the pants remain whole throughout the rest of the sequence. Also, Edgar's shoes are removed and lost, but he still has them later.
Errors in geography: The label on the trunk stated it was going to "Timbuktu, French Equatorial Africa". Timbuktu (or Tombouctou) is located in Mali, which was never part of French Equatorial Africa.
Continuity: While Marie and Berlioz fight, Toulouse accidentally drops a candle on Marie's head. When Duchess arrives to scold them, the candle can be seen lying next to Marie. A couple of shots later, the candle is gone.
Continuity: During Edgar's first encounter with Napoleon and Lafayette, the wheel on the side car changes sides repeatedly after it is detached.
Continuity: In the country lane shot right before we first meet Napoleon and Lafayette, Edgar's motorcycle's side car switches sides. This is due to the series of cells being photographed backwards while editing.
Continuity: While Toulose is painting a picture of Edgar, the red paint can be seen dripping down the canvas. In the next shot, there are no red drips
Continuity: During Marie and Berlioz's playing, Berlioz's bow comes untied. His bow is tied again after Toulouse's painting and then is untied again while playing the piano.
Continuity: Frou-Frou (the horse) bites off the tails on Edgars tux after he puts the cats in the trunk and tries to push them outside to be shipped to Timbuktu. Then in the next scene the tails re-appear.
Continuity: In the first shots of the milk delivery truck driving down the road no crank handle is seen on the front bumper area. However, after O'Malley stops the truck, the driver gets out and restarts the truck with the crank which is now visible.
Continuity: When Scat Cat and his gang are playing "Everybody Wants To Be A Cat", one of the cats is playing the guitar left-handed, and a moment later right-handed.
Continuity: When Edgar put the padlock on the trunk, the hinge of the shackle is on the right hand side. When Roquefort opens it, it's on the left.
Continuity: The color of the ribbon on the cats' basket is normally blue, but as Edgar makes his second escape from the dogs with it, it is pink.
Continuity: When Lafayette bites Edgar's leg, we see he is barefooted. In the next scene, one of his feet has a shoe, and then it's bare again.
Factual errors: When Edgar is fantasizing about inheriting the Duchess's money, dollar signs ($) go around his head, even though the movie takes place in 1910 France (they don't use dollars). However, this may have been used so as not to confuse little kids in America.
Continuity: When Toulose is painting, he steps on the tube of blue paint and we see it squirt out and land on the floor next to Berlioz. Once Toulose has finished the painting, the paint on the floor appears red instead of blue.
Continuity: When Edgar gives the cats their milk, as he is exiting the room saying "Sleep well...”, the cuff-link on his right hand (which is usually seen as red) is seen uncoloured (or just white) for a few frames, and then reappears as red again.
Continuity: The character of Duchesse is very different in the second scene (the will), than in the rest of the film. In particular she has her nose more clearly defined. The rest of the scene seems also to have been designed by different animators, who used a more "sketchy" style.
Continuity: In the "Scales and Arpeggios" scene, Toulouse jumps on the piano with orange and green paint. At the end of the scene, he has orange and blue paint on his paws.
Continuity: In the scene where Thomas O'Malley is saving Marie after the train passes, he grabs a log. You can see the white boot marking on his foreleg disappear. When his paws go into the water and come out, the white marking reappears.