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. [Peter doesn't consider Caspian summoning them to be a mistake - after all, it gave him exactly what he wanted, a way back into Narnia. From Peter's point of view, Caspian did exactly what he should have done in summoning the Pevensies, then screwed it up later by thinking that he could be in charge.]

In the scene where 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. [This is just like in the first film, when they went from adults in Narnia, back to kids again in England. Her hair went back to the way it was when they were in the train station in the beginning of the film.]

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. [1. He had plenty of time to be filled in by guards and by the whole scene in the room with all the royals discussing the Prince's kidnap to realise that the guy was Prince Caspian. 2. The blowing of the horn and the coming of the High Kings and Queens of Old would result in rebellion. Seeing them, he would expect it. 3. He took them to the place where they were to meet if planning things. It wasn't Caspian's stronghold, it was that of the Narnians.]

In the scene in which 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. [It's not in his sheath. You see him bend down to pick it up right at the end of the scene.]

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. [You're talking about our rules/laws/customs. This is an entirely separate plane of existence. They do things differently there. Also, differences between books and their film adaptations are immaterial in regards to anything on this site.]

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? [Just because they've got something that resembles our fireworks doesn't mean they can (or want to) turn them into a weapon. Remember, magic exists in Narnia: there very well may be no gunpowder involved at all. At any rate, there's not enough info here to warrant a mistake.]

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. [These are all matters of opinion, from someone who apparently didn't much care for the changes made to the story. If Miraz kills Caspian and becomes king, who's going to prosecute him for the murder of Caspian? The nobles remained with Miraz because they felt he had the better chance of winning and because they wanted to hold on to as much power/authority as they could. Miraz would be more willing dole out favors to corrupted nobles than Caspian would.]

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). [Actually, both Peter and Edmund had blue vests on at the beginning of the movie. When they got to Narnia, Edmund took off his vest, but Peter didn't.]

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. [This is an opinion, not a mistake. Futuristic looking buildings have always been built - the Space Needle itself looked pretty futuristic when it was built in 1962. Something being "a little odd" doesn't mean it's an error. If you can identify the building and determine the year it was built in as being post-war, then, fine, that's a valid error. As you haven't, it remains purely an opinion.]

When Peter meets Caspian for the first time, he calls him by name - but nobody told Peter Caspian's name before. [After they save Trumpkin from drowning he tells them the story up to that point. They just don't show it on screen.]

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. [Trebuchets can be disassembled and made more compact for transportation.]