Trivia: Before filming the Narnia scenes, Georgie Henley was never shown the set. To get a genuine reaction of surprise, director Andrew Adamson had Henley brought onto the Narnia set blindfolded. Her reactions to Mr. Tumnus are real, too. Before filming their scenes together, she had never seen James McAvoy in costume.
Trivia: When the children listen to a news report on the radio, in Professor Kirke's house, the voice belongs to Douglas Gresham, who is C.S. Lewis's stepson, and co-producer of the film. C.S. Lewis, author of the original novel, delivered radio addresses over the BBC during World War II.
Trivia: In the scene where Susan runs in with Aslan and the rest of the army she pulls her bow back and the shot ends. When they were filming she was so "in the moment" that she let the arrow fly. By the end of production the crew still hadn't found it. Apparently it is still there waiting for some very adventurous fan to climb up and find it.
Trivia: At the train station, Peter glances at a certain soldier. The person portraying the soldier is Jaxin Hall, the actor who lost the role of Peter when they cast William Mosley as the eldest.
Trivia: The wardrobe that C.S. Lewis based the story on can be seen at Wheaton College in Wheaton, Illinois.
Trivia: When the Pevensies are telling the Professor of their doubts about Lucy and her tales of Narnia, he proposes three possible conclusions: that Lucy is either crazy, lying, or telling the truth. C. S. Lewis famously proposed these very same options as what he dubbed "The Trilemma of Jesus", focusing on whether He was lunatic, liar or Lord.