Revealing mistake: While Miss Hannigan is singing "Little Girls", she sees one of her foster girls as a lamp on a table. As the camera and scene continue down the hall, a foot can be seen in the background as the girl jumps off the table to be replaced with a real lamp.
Revealing mistake: When the family and Paddington are approaching the fictional "Westbourne oak" tube station the real original sign for "Maida Vale" is in shot.