Trivia: John Cusack's real-life sister, Joan Cusack, is wearing a neck brace on the bus at the beginning of the film.
Trivia: At the start of the first scene, when Nisi serves the customer she calls Nate, he is played by Rudy Ray Moore, known for the title role in the 1975 film Dolemite one of the most popular Blaxploitation films of the 70s. After Nate refuses the burned toast, Mickey tells Nisi, "Girl, don't pay him no mind, he thinks he's Dolemite." Also, note the name "N. Townsend" on Nate's uniform patch, which is the last name of the director, Robert Townsend.
Trivia: The infant playing Connie and Carlo's baby son Michael Francis Rizzi who Kay holds during the christening scene is Sofia Coppola, Francis Ford Coppola's daughter, who was born in May 1971. Sofia later had a prominent role in Part III as Michael's daughter, Mary. Other than the main characters, Sofia is the only actor to have appeared in all three films. In The Godfather II, she can be briefly seen as an immigrant girl on the ship that brings Vito Corleone to Ellis Island.
Trivia: This was Johnny Depp's first movie.
Trivia: The entire "How am I funny?" scene was improvised by Joe Pesci and Ray Liotta.
Suggested correction: False. Joe Pesci told the anecdote to Scorsese in the earliest stages of the movie. Scorsese asked him to add it during previous script readings and further rehearsals while notes were being taken by crew members. Then it was finally shot following those rehearsals and notes. In this video all the actors involved tell how Scorsese works and even he himself says he rewrote that scene 4 times. Minute 13:04: https://youtu.be/_bbzUZuxEB8.
I have actually seen interviews where they admitted it was improvised. The reactions from the other actors was genuine.
Trivia: John Travolta made up the "cool dude walk" that Danny uses in the first scenes, when trying to create a bad boy image.
Trivia: When Neville receives a Remembrall from his grandmother, it glows red to inform him that he forgot something. Neville says that he can't remember what he forgot. If you look closely, Neville is one of very few students not wearing his robe. He most likely forgot to put his robe on.
Trivia: When James Brolin was offered the role of George Lutz, he was informed that they didn't have a script to give him. James bought a copy of the novel and began to read it. At two o'clock in the morning, while reading a very intense part of the book, a pair of pants that he had hung up earlier fell to the ground causing him to jump in fright. After that, James agreed to do the film.
Trivia: When Hagrid is welcomed back to Hogwarts and everyone stands up and applauds, Vincent Crabbe also stands up and starts to applaud as well. This wasn't in the script and Tom Felton, staying in character, quickly grabbed Jamie and pulled him back down.
Trivia: All of the entire cast performed their own singing.
Trivia: In the entire movie the word 'LEGO' is never spoken once.
Trivia: According to the Guinness Book of Records, the Lord of the Rings holds the record for the greatest number of false feet used in one movie: 60,000.
Trivia: Professor Marvel, the Cabbie, the doorman, the guard, and the wizard himself are all the same actor, Frank Morgan.
Trivia: The film is a remake of Shakespeare's comedy play "The Taming of the Shrew".
Trivia: Richard Gere actually plays the piano - and he composed this piece himself.
Trivia: When General Ross is drinking at the bar, his drink is made up of equal parts of Hennessy, Cognac and Hypnotiq liqueur. The name for this drink is an "Incredible Hulk."