Continuity mistake: When Billy crosses the road and says goodbye to Mrs. Wilkinson's daughter, she is standing in front of a giant advert poster. A police van drives past, and when it leaves the scene again, the girl isn't there any more. With the van covering her for not even one second, she could never walk away in this short time.
Suggested correction: I'm not sure if this can (or should) be classified as a "continuity error" in that the sudden "vanishing" is meant to be movie magic or part of the entertainment (as opposed to trying to give the impression that the girl was actually physically able to board the bus or walk away that quickly). I've seen this same type of "disappearance" in several movies and believe it is part of the "comedy" (and "Billy Elliot is classified as a comedy, although it is hardly the "LOL" type).
