Tilda SwintonTilda Swinton, as well as playing The White Witch, also makes a short cameo as a centaur.
A romantic subplot between Anna PopplewellAnna Popplewell's character and Ben BarnesBen Barnes' Prince Caspian was in an early draft of the script but was mostly dropped. In the book they don't even meet until the very end of the story.
Over 100 actors auditioned for the voice of Reepicheep before Eddie IzzardEddie Izzard was cast. He based his performance on Errol FlynnErrol Flynn.Anna PopplewellAnna Popplewell had to absent herself from several days filming to complete her school exams.
Anna PopplewellAnna Popplewell was disappointed that Susan didn't get to use her bow much in the first film. Which is why she uses it so often in this one.
Peter DinklagePeter Dinklage's prosthetics took 3 hours to apply. On his first day of filming, he also had to contend with being bitten by sand flies and falling into a river. Producer [?] Mark Johnson joked that they were lucky that Dinklage returned after his first day.
When he was cast, Ben BarnesBen Barnes was set to tour as Dakin with the Royal National Theatre's production of The History Boys. Barnes left England without telling the Theatre. They considered suing him for breach of contract but then decided against it. To get into character, Barnes wore hair extensions and shaved twice a day. He patterned Caspian's "Spanish" accent on Mandy PatinkinMandy Patinkin's Inigo Montoya in The Princess Bride.
During the storming of Miraz's castle, Reepicheep's mice find the royal cat asleep. They tie him up in the same way that Aslan was tied in The Chronicles of Narnia: The Lion, the Witch and the Wardrobe. The mice gnawed through Aslan's ropes in that story, and Aslan granted their species the power of speech in honor of their devotion on that day.
Nikabrik in this film is a descendant of Ginaarbrik from the previous film, and wears the family ring. This detail is not in the C.S. LewisC.S. Lewis writings; it is a retcon by the filmmakers. They named Ginaarbrik (who had simply been "the Dwarf" in the book) and gave him the familial connection, after noting the similarities between the two dwarrow from different time periods.
During filming, Georgie HenleyGeorgie Henley (Lucy) lost two baby teeth. A bridge had to be created to fill in the gaps.
Actor Warwick DavisWarwick Davis (Nikabrik) appeared in the older BBC versions of this tale and its companions. He portrayed Reepicheep in Prince Caspian and the Voyage of the Dawn Treader and Glimfeather in The Silver Chair.