 FAKE: When Harry and Hagrid hug (when Hagrid has just returned from  Azkaban), the flames in the bowls hanging on the wall behind them  burn backward briefly. This occurred because (according to Emma  Watson in an interview on the Prisoner of Azkaban DVD) the  filmmakers paused this shot. This was because Emma was so  embarrassed to hug Daniel in front of everyone, they had to stretch,  or replay a portion of the shot to get the right length of footage.