Great Mouse Detective, The - Wrong Coat
Near the end of the movie when Basil is saying good bye to Dawson, Olivia and Olivia's father, Dawson and Basil are talking and Dawson is wearing a blue/black coat. In the next shot Dawson walks over to a railing and he is not wearing the same coat. Then he picks up the coat from off of the railing and puts it on. Its not really a big mistake but it is kind of amusing.