Factual error: When Edgar the Butler directs the Old Solicitor upstairs they have a bit of a struggle with the steps. Before this you saw the Solicitor arriving in his car and this gave you an impression how high the first floor of the building of the Old Spinster was. Judging by the amount of steps on the stairs the pair would have ended up on the roof.
Factual error: In the scene where the three kittens are playing train on the train bridge, Barliose is standing in front, then Toulouse then Marie. After Barliose says, 'Marie's the caboose' you look at Marie's reaction and Barlioses is painted in front on her instead of Toulouse.
Factual error: At the very beginning when the family are in the cart being pulled by Frou-Frou, the way Frou-Frou is trotting is completely wrong compared to how a real horse trots. When she is moving it is front and back right, and then front and back left. It should actually be front right and back left and vice-versa.