SPEAKING OF HARRY POTTER ...

Am I the only one who finds it weird that throughout the series they point at that no one can apparate into, out of or within Hogwarts school and yet the house elves have no problem doing just that??

SPOILERS AHEAD

In the recent installation, Harry Potter and the Half Blood Prince, Harry and his friends are learning to apparate, and the restrictions are lifted from the great hall for only an hour. This, once again, accentuates that no one can apparate within the confines of Hogwarts, and yet Dobby and Kreacher both apparate and appear to Harry when he calls them from the kitchens in the basement to wherever he is.

If anyone has an explanation I'd love to see it in the comments. :)