When Krendler visits Clairice in her basement office, she is sitting back with her feet up on the the desk. As the shots change back and forth, her crossed legs change position several times.
When Hannibal is reading newspaper headlines propped up on his piano, one of them purports to be from Washington, D.C. However, the headline uses the British phrasing, "Drugs Bust," instead of the American "Drug Bust," giving away the true source of the printed prop.
Hannibal is based on a 1999 novel of the same name by American writer Thomas Harris. The novel was adapted for the movie by American screenwriters David Mamet and Steven Zaillian. Hannibal is the film sequel to The Silence of the Lambs (1991). It was followed by Red Dragon (2002) and Hannibal Rising (2007), both adapted from novels by Thomas Harris and written as prequels to The Silence of the Lambs. Prior to The Silence of the Lambs, there was another Hannibal Lecter movie, Manhunter (1986), also based on Harris' 1981 novel, Red Dragon, but not considered to be part of The Silence of the Lambs franchise.
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A Note Regarding Spoilers
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The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. Spoiler tags are used sparingly in order to make the page more readable.
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What is the song that is being played at the opera that Pazzi and Lecter attend?
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The song is called Vide Cor Meum (See My Heart). Composed especially for the movie by Patrick Cassidy, the song was later used in Ridley Scott's Kingdom of Heaven (2005).