The Baruna Bridge location was the strikingly beautiful Soca river in the Slovenian mountains. After 9 months of negotiating red tape, the production were allowed to temporarily divert the flow of the river whilst they built the bridge. The authorities had already been considering this themselves due a landslide the previous year, which had harmed the flow. Once it had been completed the river was rerouted back to its original flow. 100 trees had been specially planted to tie in with the description of the location in the book.
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 (2005). 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.
In the beginning of the movie, when the four kids go to Narnia, they are in the Strand subway station. In Swedish, Dutch, Danish and German, "strand" means "beach". When they arrive in Narnia, they arrive on a beach.
Anna Popplewell was disappointed that Susan didn't get to use her bow much in the first film; when she mentioned this to director Andrew Adamson, this film's script was altered to add more scenes with her using it.
When he was cast, Ben 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 Patinkin's Inigo Montoya in The Princess Bride (1987).
When the Pevensie children arrive at Aslan's How, they are shown a cavern with wall paintings of scenes from the first film. As they leave the tunnel, the camera lingers on a painting of Mr Tumnus and the lamppost, and the score plays a brief snippet of the Narnian lullaby that Tumnus played for Lucy.
Peter 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.
8 months were spent scouting locations, including Ireland, China and Argentina. Although parts of the film were made in New Zealand like its predecessor, the majority of shooting took place in Czech, Slovenia and Poland because of the larger sets available. The stone prop was flown from New Zealand to Barrandov Studios in Prague, Czech. In a remote Slovenian location, everyone had to be checked for ticks on a regular basis, since infestations in the cast and crew's hair were common. Because of tax credits, post-production was based in the UK to qualify the movie as a British film.
Work on the script began before The Chronicles of Narnia: The Lion, the Witch and the Wardrobe (2005) was released, with a projected release date of 2007. However, the producers' many concerns regarding the novel Prince Caspian (2nd Narnia book written, 4th in retroactive "chronological" order) caused delays. At one point they considered skipping Prince Caspian and moving on to the next book in the series, The Voyage of the Dawn Treader, likely because Caspian is more character-driven and less action-oriented then the high adventure of "Dawn Treader" or "The Lion, the Witch and the Wardrobe". On the other hand, leaving out Prince Caspian's book would have robbed him of his proper introduction, and his presence on the Dawn Treader would make no sense to an audience. A repeat of the late 1980s BBC television strategy was considered, wherein "Prince Caspian" and "Dawn Treader" would combined as two segments of the same feature film. Director Andrew Adamson found a way to have the film stand on its own by adding a grand scale castle battle to the storyline, to make this film more epic and action oriented (the book does not have a corresponding scene). In hindsight, Adamson regretted the decision to make this second trip to Narnia bigger and more overblown than the first.
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. 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.
The enchantment used at the circle to conjure the White Witch is actually an old Lebanese song by a singer called Sabah; it translates into: "If it weren't for your eyes, we wouldn't have come, my oh my."
Susan is browsing the magazine cart at the beginning of the London scene. What she is reading is the Dec 9 1939 issue of Picture Post. The Land Girl featured on the front cover is part of a civilian war effort group known as the WLA, Women's Land Army. It was started during WW1 to replace the men on the farms and in the factories in both the UK and USA.
Although this film was quite successful (nearly US$420M box-office on a budget of US$225M), it was far from the blockbuster success of the first film. As a result, Disney declined co-production on the rest of the series. The next film in the series, The Chronicles of Narnia: The Voyage of the Dawn Treader (2010), was co-produced by Walden Media and a new creative partner, 20th Century Fox.
When Prince Caspian is walking through the forest and meets Reepicheep, the forest floor is covered with ferns. The filmmakers found a forest exactly like it in Poland, but discovered that it was cheaper to bring fake trees and 5,000 potted ferns into a studio than to bring all of the equipment to Poland and get permission to shoot there. They also later found out that the forest floor in Poland was filled with brambles.
The trivia items below may give away important plot points.
Throughout the film it is often mentioned that many years have gone by in Narnia after the Pevensies left. Although the leads say that centuries have lapsed they don't specify the exact amount of time. The readers of the book know this tidbit of information but the viewers of the film are informed about it in the final scene taking place in Narnia. When Susan says goodbye to Caspian she finally reveals that 1300 years passed in Narnia time, reminding him that she is much older than he is.
A romantic subplot between Susan and Caspian was in an early draft of the script but was mostly dropped; what remains are chaste hints that the characters are attracted to one another, but put this aside in the interest of the greater conflict.
The spear that is used to summon the White Witch is actually the fragment of the cane that the White Witch used in the first film to freeze living creatures. Edmund had broken it in two halves during his fight with Jadis and the hag uses it here to form the ice wall by striking it on the enchanted circle.
The magic circle that is used for the conjuring scene of Jadis is enchanted. Although never mentioned explicitly, whoever stands inside the circle is under the White Witch's frozen spell and is seduced by her magic powers. This explains why both Caspian and Peter are inert when they are inside the circle, standing in awe of the Witch's presence who tempts them both to give her a drop of Adam's blood. The only hint is the icy fumes coming from the mouth of Tilda Swinton and consequently from both Ben Barnes and William Moseley.
In the beginning Susan shoots with her bow a Telmarine soldier in order to save Trumpkin's life. Although it is unknown if the soldier survived his injuries, the arrow is used by Miraz to prove the existence of the Narnians to Professor Cornelius and Lord Sopespian. Specifically Miraz points the arrow at the drawing of the "4 Kings of Old" on the history book that Cornelius possesses. Lord Sopespian is then left in the study room alone. The arrow is finally used by Sopespian in the final scenes to stab Miraz and incriminate the Pevensies for treachery.