Celebrity Voice Actor: Most of the cast, as is SOP for big-budget animated films. Maurice LaMarche as the King is the token "legit VA". (Character actress Edie McClurg, known for her distinctive voice, also plays a prominent role.)
Completely Different Title: Is known as The Snow Queen in some European countries, reportedly because of Europe's strong cultural bond with Hans Christian Andersen, even though the movie only resembles his Snow Queen in a very loose way. A number of other countries changed the title to "Kingdom of Ice" or some variation on it ("Snow Kingdom", "Land of Ice", etc.).
Development Hell: The film is over 70 years in the making.... Walt Disney himself even had ideas for an adaptation of the story! Disney planned to produce this in The Nineties as a hand-drawn feature, but they scrapped it during their change in management and their shift to CG features starting with Chicken Little and only just recently picked it up again.
Dreamworks Face: Strangely enough, it's Elsa who's doing this on the poster.
Dueling Movies: A Russian animation company put out a Snow Queen adaptation around the same time.
An American stage musical adaptation debuted the same week as Frozen did, as well.
The Foreign Subtitle: Some countries keep the main title of Frozen, but add a subtitle in their local language, most commonly translating to "The Kingdom of Ice" or "A Freezing Adventure".
According to the book Disneywar (about Michael Eisner's tenure as Disney CEO), a Turn of the Millennium pitch for what was then called The Snow Queen had, as the lead character, a monarch who freezes all her potential suave-but-phony suitors and becomes both a literal and figurative Defrosting Ice Queen once she meets a true-hearted man.
Elsa was going to be the villain, and she and Anna would be unrelated. Even after making them sisters, Elsa was still the villain (though she'd be redeemed in the end), and instead of fearing her powers she was more angry at having to hide them and flat-out resentful toward Anna. Ironically it was only after making the Villain Song for her, "Let it Go", that she was changed into an Anti-Hero / VillainDeuteragonist.
The sisters' relationship as rivals was very different at first, and can still be seen in some of the supporting material (like A Sister More Like Me, by some of the creative staff). Anna was the free-spirited "spare" with no responsibilities, and Elsa as the prim, proper "heir" who resented Anna's freedom and irresponsibility. In the deleted song "Life's Too Short" has the girls basically act like stubborn twits to each other, making both a lot less sympathetic.
Sven was originally going to have only one antler.
There was going to be more snowmen than Olaf and Marshmallow. And the snowmen would eventually go on a rampage, hurting everyone in their path, something that Elsa was against.
Many of the cut songs have been released as demos on the deluxe soundtrack. Anna has an Establishing Character Moment song, Anna and Elsa's song is a lot more direct and confrontational, Hans's song is a lot vaguer and hints at his being Evil All Along and there's an opener song featuring Anna and Elsa as children that shows their relationship.
Kristoff was going to have a larger role in the climax, taking out Hans after the prince has a villainous second wind and attacks the sisters again. This was wisely cut so that the focus be kept on the two sisters where it belonged, rather than a battle between two male characters.
Working Title: Was The Snow Queen for many years, as discussed above; by 2008 it had become Anna and the Snow Queen before progressing to its final title in 2011. Curiously, the Japanese version keeps that name there.