Continuity mistake: In the scene when Charming "stabbed" Shrek and there is a close up of Charming, you will see Arther in the background with no one behind him. However, in the close up of Arthur after the close up of Shrek, Fiona is behind Arthur. (01:17:40)
Continuity mistake: When Snow White rips off her sleeves she has a tattoo on her right shoulder. Later, when she calls the animals to attack the guards, the tattoo is gone.
Continuity mistake: The pink legwarmers Charming is wearing in the middle of the film, instantly disappear.
Continuity mistake: In the end of the movie, during the play, when all the fairy tale princesses break through the wall, from the side view you can see Cinderella, Snow White and Doris standing and not Queen Lillian. But in the next scene Queen Lillian is standing behind all of them. So you should have seen her in the earlier scene.
Continuity mistake: The "I Suck-eth" sign on Donkey's butt disappears after we see it.
Continuity mistake: In the scene where Charming and his goons storm the castle, Fiona is trying to close the secret passageway and doesn't get it closed in time. But when Charming bursts in, the passageway is completely closed.
Continuity mistake: When Shrek, Donkey and Puss-in-Boots are leaving on the boat saying goodbye to the others, the dragon switches sides on the dock.
Continuity mistake: When Fiona is telling Shrek she is pregnant, Dragon is constantly changing position.
Continuity mistake: When Puss is on Shrek's shoulder his sword is at his right, but in the next shot the sword is at his left.
Continuity mistake: When the gang get shipwrecked on the island, there is no debris on the sand. However a log appears that Shrek picks up.
Continuity mistake: In Shrek the Third, Rumpelstiltskin looks completely different than in Shrek Forever After.
Continuity mistake: At the end of the film during Prince Charming's performance where he is going to kill Shrek, when Dragon flies in she burns and melts his sword, but a few moments later the sword is full and not half melted.
Continuity mistake: When the boat crashes, Puss shakes and his fur comes up, but then after that it's fine.
Answer: He was arrogant and narcissistic, who believed the throne was his because he was a prince, charming and handsome. A legend in his own mind.