When Larry and Bob are consoling Madame on her sofa, Bob disappears momentarily while Larry fetches tea.
No way the Stuff Mart would start construction, finish, and open on the same day.
Madame Blueberry's hair changes color, black, blonde, black. This could be done by her "Stuff" beauty products.
The toy train and its shadow are traveling in opposite directions.
In the DVD subtitles, "Monsieur" is transcribed "Missure" in one instance.