Corrected entry: When Peter first dislocates his arm in the fight with Miraz, his arm is snapped backwards, away from the body. However, when Edmund later "relocates" it for him, he is still pushing it backwards, away from the body, which would just dislocate it even more.
Corrected entry: The underground train, at the end, has sliding doors. Sliding automatic doors weren't invented until 1954.
Corrected entry: When Caspian and Peter are arguing, Caspian says that summoning the Pensives was his first mistake and Peter says that his first mistake was thinking that he would lead the Narnians. But Caspian blew the horn (summoning the Pensives) before he agreed to be 'King' of the Narnians.
Corrected entry: When the Pevensies go through the door to return back home to England, Lucy's braids are tied together. But in the next shot, right before she goes through the door, her braids are separate and not tied together.
Corrected entry: Trumpkin was captured by the soldiers right after Caspian hits his head so Trumpkin would not have known: 1) that Caspian was Prince Caspian; 2) that the old Narnians have gathered and were planning a rebellion; 3) where Caspian's stronghold was. But, when he meets the Pevensies, he knew all of that and led them to Caspian.
Corrected entry: When Peter and Caspian are fighting, Peter knocks Caspian's sword away, but in the next scene when Caspian gives Peter his sword back and the camera goes out to a high angle, miraculously Caspian's sword has returned to its sheath.
Corrected entry: Miraz isn't crowned King until midway through the movie. Yet before that point, Caspian is still referred to as "Prince," so he isn't the King either. So who is? Miraz is identified as the Regent, but a regent is a person who reigns in place of a king who isn't of age yet or is otherwise unfit to rule; i. e. the other person is still King (and usually has some limited authority), although he doesn't rule yet. That does not seem to be the case here. Either Miraz should already be King, or if Miraz is a regent, Caspian should be King. This mistake is only in the movie; in the book, Miraz is King from the start.
Corrected entry: Fireworks are shot up at the beginning of the movie (to announce the birth of Miraz's son) and at the end of the movie (for Caspian's coronation). For the Narnians to have fireworks, they must have gunpowder (and from the modern appearance of the fireworks, must have had it for some time), but if that's the case, why are their battles still fought with swords and crossbows? Shouldn't they have firearms by now?
Corrected entry: In the opening sequence in the movie, Miraz sends at least a half dozen soldiers to kill Caspian by massive crossbow fire while he sleeps. Later, none of the other members of the court of nobles has any clue that an assassination attempt was even made. Historically, unless an usurper wished to make plain that he killed the rightful heir, such blatant shows of force would not be used because of the near certainty that the act would be discovered by someone's spy. Another is that Miraz is made king by unanimous consent when Caspian, the rightful heir, re-emerges in league with the Old Narnians. It would make sense that at least a few nobles would have had pause or joined the rightful heir. Both of these are only plot holes in the movie and are departures from the plot of the book itself, which has a seamless plot.
Corrected entry: At the beginning (train station and beach), Peter is in a white shirt and Edmund has a white shirt and blue vest. When they're exploring the ruins, it's reversed (Peter with vest, Edmund without).
Corrected entry: Early in the film when the children are walking the streets of England, in the background is a structure that resembles likes of the Seattle Space Needle. Being this portion of the film was suppose to be around the time of World War II, it seemed a little odd to have such a futuristic structure in the background.
Corrected entry: When Peter meets Caspian for the first time, he calls him by name - but nobody told Peter Caspian's name before.
Corrected entry: To reach the battle ground at the Narnian headquaters, the troops had to travel through the woods. The trebuchets were also able to make it through the dense woods without any problems, even though they are much larger than the trees.