When Harry succeeds in getting onto Platform Nine and Three-Quarters at King's Cross, the first thing he sees is a scarlet steam engine. The engine should be at the front of the train, and the entrance to the platforms at any terminus - certainly at King's Cross, magic or not - is at the back of the train (otherwise, the train has to leave through the station concourse). So the engine seems to be at the wrong end (this slip-up is repeated on the cover of the book).