A nameless member

Trivia: In the original book, the boy who's friends with the snowman isn't given a name. In the film he's given a gift by Father Christmas with a nametag on it, so the filmmakers opted for James, the husband of one of the animators.

Trivia: This was originally conceived as The Santa Clause 4, then repurposed into an original film.

Trivia: The short tune Noelle sings to bring Snowcone to her is the same tune Anna Kendrick sings in Into the Woods when she played Cinderella.

Trivia: Robert Downey Jr. credits this part with winning him the role of Iron Man.

Trivia: The title was suggested by Val Kilmer - it was originally called simply "Bang!"

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.

Trivia: One short shot shows a paperboy falling off his bike. This wasn't scripted, but they kept in in the film anyway, despite the actor breaking his wrist.

Trivia: Shirley MacLaine kept improvising, much to the chagrin of the writer and director. She was made to do multiple takes of one sequence because she kept missing a word out.

Trivia: The last black and white movie to win the Best Picture Oscar, until The Artist in 2011.

Trivia: The Christmas party was really filmed just before Christmas, with almost all of it filmed in the first take as everyone was in the holiday spirit already. Director Billy Wilder said "I wish it were always this easy. Today, I can just shout 'action' and stand back."

Trivia: To make the office appear larger than it was, the team used forced perspective - adult actors at the front, with child actors behind them, and tiny desks with wire-operated dolls at the back.

Trivia: Ryan Reynolds' fat makeup took 4 hours to apply.

Trivia: Small children have told Billy Bob Thornton they like the film - he was reportedly "stunned" that parents would allow their kids to watch it.

Trivia: Billy Bob Thornton has said he really was drunk during some scenes.

Trivia: Vince Vaughn plays Paul Giamatti's older brother, despite being 3 years younger.

Trivia: Siblings Anonymous features three real brothers of celebrities: Frank Stallone, Roger Clinton, and Stephen Baldwin.

Trivia: The studio spent a fortune on fake snow to use in Central Park, only for a real blizzard to descend during filming.

Trivia: The sequence where the pigeons attack Joe Pesci and Daniel Stern was filmed by covering them with birdseed and unleashing 300 real pigeons.

Trivia: All the children from the toy store were allowed to keep a toy as part of their pay.

Trivia: Jim Carrey's makeup took 2 hours to put on and 1 hour to take off, every day for 92 days of filming.