Herein I begin the first formal edition of observed internal contradictions in the seven volume Harry Potter series by J.K. Rowling. I expect internal contradictions to be an occasional series on this blog.
Today's example references book 1: HP and the Sorcerer's (or Philosopher's) Stone and book 6: HP and the Half-Blood Prince. In book 1 Harry rides the Hogwarts Express to school for the first time, on September 1, and as they are arriving in Hogsmead, hears the train conductor announce something like "Leave your luggage on board, it will be brought up to the school for you."
In book 6 Harry puts on the invisibility cloak and sneaks into Draco's compartment to spy on him. Draco catches Harry, puts a full-body bind curse on him, and covers him with the invisibility cloak. Harry lies on the floor of that compartment unable to move or speak. He is eventually found by his "minder" Tonks, when the train starts to leave and he hasn't shown up. The whole time he lies there nobody comes into the compartment to get the trunks of its Slytherin occupants. Anyone who did would have stepped on him and thus felt him although they couldn't see him.
Had someone been doing accio trunks Harry would have heard the trunks whoosh out of the compartment. He reports no such event. Hence, in book 6 student luggage was schlepped by the students themselves, while in book 1 some unseen force (probably the 100+ house elves of Hogwarts) was schlepping the luggage. It sounds like Hogwarts has cut this posh service by his sixth year.
Credit for spotting this internal contradiction goes the the other DrC. Comments on this post are, as always, welcome....
