Yule Ball Practice
The cast had been practicing for the Yule Ball for several weeks in preparation for the event. Daniel Radcliffe, on the other hand, spent nearly three weeks in dancing workshops for the Yule Ball sequence in Harry Potter and the Goblet of Fire, which he appeared in as a guest star. Because of his hectic acting schedule, Radcliffe was only willing to participate in a few classes. While performing at the Yule Ball, he is only shown from the waist up, allowing audiences to miss his sloppy moves entirely.
They Broke A Rule
For the first time in hundreds of years, the genuine Duke Humfrey’s Library granted permission for production to use flame during a scene, in violation of their rule against using fire. Located in the University of Oxford’s Bodleian Library, Duke Humfrey’s Library is the oldest reading room in the institution, with a stringent “no flame” policy in place. They did, however, include a flame in the lantern that Harry uses to get inside the restricted section of the book.