
Trivia: Clark Griswold in the attic watching old movies dressed in a woman's turban and gloves to keep warm is not only funny but a reference to the Norma Desmond character from "Sunset Boulevard", who watches her old films to remember her Hollywood glory days.

Trivia: When the Grinch takes the table cloth from the table, everything on the table was supposed to fall off. When Jim Carrey yanked out the cloth however, everything stayed in place. Jim immediately walked back to the table and improvised knocking everything off and then knocking the table over.

Trivia: The "Sisters" comedy act was completely improvised by Bing Crosby and Danny Kaye.

Trivia: When Kevin is in Buzz's bedroom, he finds in the box a picture of Buzz's girlfriend. This is actually a picture of the art director's son dressed up to look like a girl, because the director, Chris Columbus, thought it would be too harsh to make fun of a girl like that.

Trivia: When Mr. Gower berates a young George for not delivering the medicine, H.B. Warner was drunk and the slaps he gave to Robert Anderson were real. The slapping caused Robert's ear to actually bleed.

Trivia: When Edward is driven into town, the car passes a house with children playing on a slip 'n' slide on the front lawn. The boy running and sliding is future Backstreet Boy Nick Carter.

Trivia: Eddie Murphy's entire scene in the jail cell with his "Karate" impersonation was ad-libbed, there was no script direction at all. (00:23:30)

Trivia: Executive Producer Peter Billingsly has a cameo as the ticket agent at the airport. Peter also played Ralphie Parker in the 1983 movie favorite A Christmas Story.

Trivia: When Kevin arrives at New York Airport, the woman at the counter who tells him which city he's in is Ally Sheedy. This film was written and produced by John Hughes, who also directed her in the 1985 film "The Breakfast Club."

Trivia: During filming, Alan Rickman was found proficient at mimicking American accents; the scene in which McClane and Hans Gruber meet was then inserted.

Trivia: Largely improvised. The actors were told the main points and events of each scene, and would make up dialogue around that.

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: Mel Gibson references the Three Stooges several times in the film. In real life, Gibson is a big Stooges fan, and in 2000, he produced the biographical TV movie "The Three Stooges."

Trivia: Will Ferrell actually walked down Lincoln Tunnel in full costume, causing several minor accidents.

Trivia: When the real Santa and the fake Santa are fighting on the sleigh when the fake Santa is heading out to deliver coal to all the children, the fake Santa says something like 'You are a strange little man.' Buzz Lightyear (voiced by Tim Allen) in the movie Toy Story said the same thing to Woody.

Trivia: The first version of the screenplay had the main roles gender swapped. It was deemed too "predatory" to have a woman in a coma and a man claiming to be in a relationship with her.