Al Pacino was helped by a school for the blind in his preparation for this role. He said that he made himself appear blind by not allowing his eyes to focus on anything.
During the disciplinary meeting, Trask tells Slade 'You are out of order!', a line told to another of Al Pacino's characters in ...And Justice for All..
Frank's bizarre habit of yelling "hoo-wah!" is an actual United States Army battlecry, although he is saying it wrong. He places far too much of a "W" sound on the second syllable. The real version is closer to "hoo-ah!"
Scenes showing the audience the Baird School and depicting it as an all male boarding school were filmed at the Emma Willard School, one of the oldest all-female boarding schools in the country.
Frank and Charlie's driver of the limousine is called Manny, as well as Manolo. Al Pacino's left hand in his movie Scarface was also called Manny, and Manolo.
As a guest on Inside the Actors Studio (Oct. 2, 2006), Al Pacino recounted to host James Lipton how he'd had an embarrassing moment in a crowded elevator after winning his first Oscar. Unbeknownst to Pacino, was that the head of his statuette was poking a well-known actress in her posterior. When she turned around, Pacino quickly explained that his Oscar, not he, was to blame for her discomfort.
"Hoo-rah" is a military acronym (usually yelled by Drill Sargents to Boots) from the acronym "HUA" which is often pronounced "hoo-ah" or in this case "hoo-rah." HUA stands for "Heard, Understood, Acknowledged." Over the years, in the US Army this phrase has taken on many meanings including; "understood?", "thanks", "I'm not listening to you", "go away", "you're a moron", "excellent!", "shutup", etc.
To force Charlie to leave the Waldorf Astoria, Col. Slade asks him for medicines and Montecristo No. 1 from a nearby street. Montecristo is a Cuban tobacco limited in the USA's territory due to Cuba's trade sanctions.
During the meeting of Berg's Disciplinary Committee, in the background on the wall of the great hall can be seen the next quote: "The place where people meet to seek the highest is holy ground". This quote was pronounced by Felix Adler (1851-1933), a prominent religious leader and Jew rationalist who created the idea about Ethical Culture.
The trivia items below may give away important plot points.
It was reported that, in order to make Chris O'Donnell cry during Lt. Colonel Slade's near-suicide scene, Al Pacino had to take him aside and scream at him "drill-sergeant style".