Trivia: When the credits have finished rolling there is a garbled radio transmission of what sounds like Rob saying "Help us." But when played in reverse you can clearly hear him saying "It's still alive."
Trivia: The bees in the dome scene are real (there were about 30,000 of them). David Duchovny and Gillian Anderson were actually in the dome with them, and neither of them wore protective gear, but weren't stung nonetheless.
Trivia: The photo of Nicky in her confidential file is actually a promotional shot taken of Julia Stiles (Nicky) in 1999 for her movie "10 Things I Hate About You."
Trivia: Kevin Spacey made sure that it was in his contract that his name would not appear in any press releases or reviews, that his photo would never appear in any of the above, he was not to be mentioned in interviews nor was his name to be anywhere in the opening credits. He cites his reason as being that The Usual Suspects and Outbreak were both opening earlier that same year and figured that people would start to recognize his name. And he also figured that if people saw his name in connection with the movie and he didn't appear for the first 2/3 of the movie they would know that he was playing the killer, thus ruining the element of shock and surprise that the moment in the movie has built up to. To compensate, Spacey is listed first in the ending credits.
Trivia: Christopher Walken doesn't speak a single word in the entire course of the movie.
Trivia: Kevin Spacey had to record the scene where Prot eats a whole banana (skin and all) 27 times.
Trivia: When the audience first meets Mike Church, he's sitting in his car, which is parked on the wrong side of the street. While most people believe this is because Kenneth Branagh is from the United Kingdom (where they drive on the opposite side of the road), it is actually because behind him are a number of skyscrapers that he, as the director, wanted included in the background.
Trivia: Director Russell Mulcahy manages to insert his name in this movie: Lamont Cranston's butler is addressed as "Russell" by Margo Lane at Cranston's residence, and there is a delivery truck with the name "Mulcahy" emblazoned on the side of the vehicle.
Trivia: K Callan, who plays Christopher Plummer's mother in this film, is actually six years younger than Plummer in real life.
Trivia: Probably the most impressive visual effect in this film is when Corso consults the twin brothers Pablo and Pedro Ceniza (rare book experts). Both Ceniza twins were played by actor José López Rodero in the subtle and entirely convincing digital effect sequence. The only flaw was that the elderly twins had identical facial wrinkles, which never happens with real-life twins. Beyond that, José López Rodero additionally played the two nameless workmen that Corso encounters at the end of the film, meaning that Rodero played four digital-effect roles in this movie.
Trivia: Philip Seymour Hoffman was the only actor who knew whether or not Father Flynn was actually guilty.
