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: 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: 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.