- Acting for Two:
- Tilda Swinton apparently cameos as a female centaur, as well as returning as Jadis for a scene.
- An unusual example with Shane Rangi, a professional suit actor who provided the suit acting and motion capture for at least six different non-human characters throughout the film (he's only officially credited for two).
- Actor-Inspired Element:
- Glozelle was originally supposed to die in the battle at the end along with Sopespian. His actor Pierfrancesco Favino suggested that he survive and volunteer to go through the portal at the end.
- Eddie Izzard's interpretation of Reepicheep was different from Andrew Adamson's original idea - who thought of the mouse as similar to Puss In Boots from Shrek 2. Eddie Izzard however interpreted the mouse as a combination of Mad Max and a Stormtrooper.
- Advertised Extra: Aslan of course. His role compared to the first film is notably smaller, but the marketing didn't exactly say that.
- California Doubling: The scenes in London at the start and end were filmed in New Zealand.
- Creator Cameo: Douglas Gresham, co-producer, is the voice that proclaims the birth of Miraz's son at the beginning. The audio commentary and behind the scenes features reveals that numerous minor roles were filled by crew members.
- Dawson Casting: More so than the first film. Only one year has passed in the timeline but three years separated the releases of the films. William Moseley was twenty one playing a teenager and Anna Popplewell was twenty. Caspian's age isn't stated but he's implied to be a teenager and Ben Barnes was twenty six.
- Deleted Scene:
Peter: Where did that come from?Susan: Mum never had that talk with you?
- After the Pevensies first arrive, Peter gives Lucy an apple from the orchard and the rest of them say they forgot to bring their lunches.
- Early on in the film, the Pevensies would witness a dryad dying painfully as her tree was cut down, similar to something that Tirian and Jewel see in The Last Battle.
- A scene humanising Miraz somewhat, where Prunaprismia is tending to the baby and wonders where Caspian could be (as she does not know he has run away).
- A few extra seconds introducing Aslan's How.
- A moment before the raid on Miraz's castle, where a centaur would be seen saying goodbye to his wife (the same one who bursts into tears after they return). Lucy glares at Peter before walking off, showing she still doesn't approve of the plan.
- Peter and Susan find Miraz's baby.
- Susan would be practising with her bow, Caspian would flirt with her and the two would spot a sentry. This is replaced with a faun seeing the sentry in the final cut.
- A scene before the duel, where Reepicheep and Bulgy Bear would argue over who gets to be Peter's second.
- Descended Creator: The film's composer Harry Gregson-Williams voices Pattertwig the squirrel.
- Dyeing for Your Art: Ben Barnes had to shave twice a day to look younger, as well as grow out his hair during filming (it was still short at the start, so he wore extensions until it grew out).
- Fake Nationality: Ben Barnes puts on a Spanish accent, which he based off Inigo Montoya from The Princess Bride. By the time of the next film, he's using his normal voice.
- Franchise Killer: A rather convoluted case. While it wasn't a complete Box Office Bomb, the movie's below-target performance was seen as a disappointment by Disney and caused them to cancel the series. 20th Century Fox would later take over adapting the remaining books, but then in 2019 they were bought out by Disney, meaning that Disney once again owns the rights to all three Narnia films.
- Jossed: It was unknown how long had passed in Narnia between the two books, only a reference to 'centuries' in the text. In the film, a line between Susan and Caspian specifies that it was 1300 years.
- Playing Against Type:
- Peter Dinklage as Trumpkin; Dinklage is famous for turning down roles that often pigeon-hole actors with dwarfish such as fantasy dwarves; in contrast to Warwick Davis who's made his career by embracing it. So him playing Trumpkin was a bit of shock. He did however accept because he felt the character's cynicism made him a little different.
- It's also mildly different for Warwick Davis to play such a devious and treacherous character. He did play the villain in Leprechaun but that was more comedic.
- Sergio Castellitto had not played a villain before, and Miraz was very different for him.
- Screwed by the Network: Disney's marketing of the Prince Caspian. Rather than release it in December as a family film (like The Lion, the Witch, and the Wardrobe was), they decided to spend enormous amounts of money trying to sell it as a teen film and gave it a summer release, about a week apart from both Indiana Jones and the Kingdom of the Crystal Skull and Iron Man. It should have been kept in December, because that's friendlier to this type of movie, but to be fair, May has shown it can expand just fine (see 2003 and 2007). And Iron Man was hardly seen as a sure thing at the time. Basing the marketing around Ben Barnes may have been a dumb move, however.
- Wag the Director: Anna Popplewell was disappointed that she didn't get to use her bow too much in the previous film. So she asked the director to change that; the script was changed to have more instances of Susan using her bow.
- What Could Have Been:
- Producers had much more trouble adapting this book than the previous one. The book has the Pevensies arriving in Narnia and Trumpkin telling them everything that happened in the story up until Miraz's forces advanced on Beruna. As such they considered simply skipping it and adapting The Voyage of the Dawn Treader instead. Likewise they also considered - as the BBC adaptations had - combining two books into one.
- At one point early in production, they considered making the Telmarines a Fantasy Counterpart Culture of the French - due to the history of English-French battles (England being represented by the Pevensies). They had intended to use Chateau de Perrefonds as Miraz's lair but, when they were unable to, went for a more Spanish feel for the Telmarines.
- The romance between Susan and Caspian was much more detailed in the original script. It was cut down to a more chaste crush and flirting, to avoid a Romantic Plot Tumor.
- Word of God: Anyone inside the circle drawn to resurrect Jadis is seduced by her powers. This is only hinted at by the fact that fumes come out of Caspian and Peter's mouths. It explains why the two of them come close to freeing her.
- You Look Familiar: Warwick Davis had portrayed Reepicheep in the BBC adaptation back in the 80s.
Trivia / Prince Caspian