Stupidity: Even though Hermione reminds them that they must not be seen after freeing Buckbeak, they fly toward the castle, whooping and cheering because they're flying. Then, they land in the courtyard of the castle, have a conversation, and then Sirius flies off with Buckbeak. Not the behavior of trying to remain unseen and unheard.

Harry Potter and the Prisoner of Azkaban (2004)
1 stupidity
Directed by: Alfonso Cuaron
Starring: Gary Oldman, Maggie Smith, Alan Rickman, Michael Gambon, David Thewlis, Daniel Radcliffe, Emma Watson, Robbie Coltrane, Tom Felton, Rupert Grint, Richard Griffiths, Robert Hardy
Genres: Adventure, Family, Fantasy, Harry Potter

Continuity mistake: When Malfoy and his friends bother Ron and Hermione, Harry shows up and messes with the three boys. He grabs hold of Malfoy's feet, lifts them in the air and pulls him across the snow. In the first close-up of the soles of Malfoy's boots, not a speck of snow is on them, though he was just walking in it. Then in the next close-up, his feet still in the air, the soles are now covered in snow. (01:02:45)
Trivia: Actor Tom Felton's Hogwarts' robes' pockets had to be sewn shut to prevent him from taking food on set.
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Chosen answer: Fred and George used the map to aid them in their mischievous activities at Hogwarts, and probably had little interest in what their little brother was doing or who he might be with at any given time.
raywest ★