Trivia: In the 40th anniversary re-mastered edition they have used Audrey Hepburn's original singing track for the "Wouldn't it be lovely" song.
Trivia: In the scene with George swinging from the Bay Bridge in San Francisco, that's actually Brendan Fraser, not a stuntman. He enjoyed the rush so much that he requested an extra take just to swing again.
Trivia: The costume department tried in vain to produce Luna's radish-like earrings. Evana Lynch made her own - they're the ones she wears in the film.
Trivia: This was the last Disney movie to include "A Walt Disney Production" at the end, as well as the first movie to be completed after Disney's death in 1966.
Trivia: Melinda Dillon was given the wrong script on purpose when they filmed the Chinese restaurant scene. She had no idea that when they brought the duck out it would have its head still attached. All of her reactions, including when she first sees the duck and when the server cuts the head off, were completely genuine.
Trivia: Originally, the store Buddy and Jovie work in was supposed to be a Macy's. However, Macy's quickly dropped out of the project when they got the script and saw that there was a scene where Buddy confronts a fake mall-Santa in the store for not being the real Santa. Reportedly, Macy's representatives indignantly told the studio that "Macy's Santa is the REAL Santa!"
Trivia: When the narrator asks George what happened to the original George, George states that the studio was too cheap to re-hire Brendan Fraser. The studio did want to bring back Brendan Fraser for the sequel, but he turned down the role.
Trivia: When making this movie, Walt Disney turned the script into a comic at first and they used these "comic strips" to move around shots and scenes, replace things and generally see what would work or not. This technique is now known as storyboarding and pretty much every single movie production uses it.
Trivia: Cesar Romero refused to shave his moustache for the role of Joker, so it's still visible under his makeup.
Trivia: During the scene where a drunken Uncle Billy walks home, a loud crashing sound is heard. The crashing sound was due to a crew member dropping a large tray of props. Thomas Mitchell quickly ad-libbed the line that he was all right. The crew member who dropped the tray was afraid he would be fired but instead director Frank Capra gave the crewman a ten dollar bonus for "improving the sound."
Trivia: James Cromwell was a long time vegetarian, but decided to become vegan after playing Hoggett in Babe.
Trivia: Marc McClure, who plays the delivery driver named Boris actually played Anna's (she was then called Annabelle) crush, Boris, in the original "Freaky Friday" (1976).
Trivia: A relief carving of Sulley (from the following Pixar film, Monsters University) is visible in the Witch's cottage.
Trivia: When Carl's house begins to lift and the little girl looks out her window, the Luxo ball from Pixar's other films is seen in her room.
Trivia: There is an actual band in Canada called the Wyrd Sisters who tried to stop the November 18th release of 'Goblet of Fire' in Canada because there is a band of the same name in the movie, but they lost their case.
Trivia: Near the beginning, when Remy is in the sewers and begins to make his way up to the skyline of Paris, he is startled by a barking dog in one of the apartments. If you pause and look at the silhouette of the dog, it greatly resembles Dug the dog, from the 2009 Disney/Pixar release Up - another precursory nod to an upcoming movie by Pixar. (00:16:35)