Sirius Black: Sorry about the bite. I reckon that twinges a bit.
Ron: A bit? A bit? You almost tore my leg off!
During the DADA class, as the Boggart balloon flies by, Lupin's eye contact with the balloon, as well as others', are not in sync as they follow the balloon with their eyes. See more...
Director Alfonso Cuaron makes two cameo appearances. The first is a man in the Three Broomsticks, Madame Rosmerta's pub, who holds a newspaper and what appears to be one candle which becomes two and then three, with quick finger maneuvering. The second is as one of the Hogwarts paintings when Harry is looking for Peter Pettigrew with the Marauder's Map. See more...
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Harry Potter and the Prisoner of Azkaban (2004) - 1 easter egg
Directed by Alfonso Cuarón, starring Alan Rickman, Daniel Radcliffe, David Thewlis, Emma Watson, Gary Oldman, Maggie Smith, Michael Gambon, Robbie Coltrane, Robert Hardy, Rupert Grint, Tom Felton (add more)
Easter eggs are hidden bits on DVDs which if you know where to look can provide all sorts of fun extras.