Trivia: Young Tom Riddle is played by newcomer Hero Fiennes-Tiffin, who is the nephew of Ralph Fiennes, the actor who plays Lord Voldemort, aka Tom Riddle.
Trivia: Christian Coulson, who played Tom Riddle in the second film, expressed interest in returning for this film, but David Yates felt Coulson was too old to convincingly play the role again. Ironically, Coulson was "too old" to begin with, being almost ten years older than the age group Chris Columbus had set for auditions.
Trivia: When Harry and Ginny are in the Room of Requirement hiding the Half-Blood Prince's potions book, you can see the White Queen from the chess game of the first movie among all the stuff kept in that room.
Trivia: In the Room of Requirement, opposite the Vanishing Cabinet, stands the bewitched harp from Fluffy's chamber in Harry Potter and the Philosopher's Stone , which was used by Professor Quirrell to put the three-headed dog to sleep over the trap door.
Trivia: The final model of Aragog that they slid into the grave weighed about 3 quarters of a ton.
Trivia: This is the only movie in the Harry Potter series to be nominated for the Academy Award for Best Cinematography.
Answer: The purpose of the Pensieve is to preserve the memory exactly as it was recorded. Telling Harry something years after an event occurred is not as effective or as accurate as seeing. It is more impactful if Harry can watch events exactly as they unfolded. Regarding Slughorn, he had refused to give his complete memory because he was ashamed of the unintentional part he played in Voldemort's plan to create the Horcruxes. He was duped by Riddle, but he still did not want anyone to know how foolish he was.
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