Visible crew/equipment: When Mrs. MacReady meets the Pevensie children at the train station, the reflector screen is reflected in the lenses of her glasses, as she looks down when she speaks to them. It is also visible when the children first arrive at the house, when Mrs. MacReady says, "There shall be no disturbing of the professor."
Audio problem: When they're standing on the breaking ice, as Peter points his sword at Maugrim, Susan shouts, "Look, just because some man in a red coat hands you a sword doesn't make you a hero. Just drop it." In the very next shot (we still see Susan's profile, despite the side shot), Susan's lips/jaw are moving, but nothing is heard, which occurs just as Peter quickly glances at her and we also hear Beaver shout, "No, Peter!"
Continuity mistake: When the train is pulling away from the station, the Penvesie children are leaning out a door window waving, and the small compartment window next to them is open, with hands sticking out, waving goodbye. In the following shot no hands are sticking out the window.
Continuity mistake: When Edmund first enters Narnia, he falls backwards out of the last of the coats and onto the snow. There is a close-up shot of Edmund as he lands on his back, and we can see a sprinkling of snow already on the front of his robe. In the next shot, he sits up, and the front of his robe is immaculate.
Visible crew/equipment: When Lucy, Peter, and Susan are riding on the ice chunk down the river, when you see a shot of Lucy struggling to maintain her grip on the ice block, immediately after, there is a shot of Peter holding what was supposed to be Lucy. However, it is not Lucy. The person Peter is holding is bigger than Lucy and had blonde-brown hair.
Factual error: When the train is travelling away from Paddington Station, the locomotive does not have a number on the buffer beam, but has a number plate on the smokebox door. It also has a large 'British Railways' symbol on the tender. In 1940, the Great Western Railway would have had the number on the buffer beam and a either a small GWR logo on the tender or Great Western in full. British Railways wasn't created until 1948.
Continuity mistake: When the Pevensies are playing hide-and-seek, there's a shot of Lucy running up the stairs. If you look closely, she is wearing the dress that she wears in her third time to Narnia, not the dress that she was wearing when she goes through the wardrobe into Narnia for the first time.
Continuity mistake: When Peter, Susan, Lucy and the Beavers arrive to Aslan's camp and see Oreius, his body is all black. In the battle you can see that Oreius has black legs up to his knees, but then his body is brown. It's easy to see just when the Minotaur drops from Oreius's back: the stomach is brown.
Continuity mistake: When the Pevensie children leave Mr. Tumnus' home they hear noises outside, so Susan places her hand on Peter's arm and Peter holds her hand. Just before Beaver appears, in the front shot, Susan and Peter remove their hands, but in the next shot they're back on Peter's arm.
Other mistake: When Aslan is resurrected, and the Stone Table cracks, you see Susan and Lucy stumble from the jolt and fall. If you watch closely, however, Susan prepares herself for the jolt before it ever happens. She throws her arms out and bends slightly at the waist, a few seconds before the jolt.
Revealing mistake: When Lucy first meets Mr Tumnus, she looks down at his legs and sees that they are not the legs of a human, but of a fawn. During this shot, Tumnus shifts his legs slightly, and it is evident that the CG legs do not exert any pressure on the snow at all. This mistake occurs at several other points in the film.
Continuity mistake: After Susan and Lucy say they don't have fun anymore, they splash each other in the water, before being surprised by Maugrim, and a few moments later, Peter runs into the water to rescue them. The water stains on their clothing noticeably differ between shots.
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Continuity mistake: When Lucy pulls the cloth off the wardrobe, a corner of it lands on her head with heavier side on her right so that for it to completely fall, it would have to fall either behind or or on her right. However, when the shot changes, it shows the cloth falling in front of her, not even coming in contact.
Continuity mistake: When the Pevensies enter Narnia, Lucy is seen in several shots with her arms at her side while Peter and Susan are apologizing to her, then her arms are suddenly behind her back to throw a snowball at Peter. She was never seen bending down to collect the snowball and Peter and Susan were surprised when she threw it at him.
Continuity mistake: When Santa puts his bag of gifts down on the ground, we see that there is a teddy bear and a quiver of arrows, among other gifts, in the bag. In the next shot of Santa reaching into the bag, the bear and the quiver are now next to each other when there were many inches apart in the prior shot.