Revealing mistake: During the wedding scene, while the narrator is talking, you can see the string that will pull the left table apart. As said in the commentary, the filmmakers weren't going for the idea of people pulling the tables apart, but rather some other force parting them. (01:27:40)
Continuity mistake: In the scene where Slannen is chaining Ella to the tree, a close up of the lock shows that it is positioned over her right hip, but when the camera pulls back, the lock is positioned over her left hip. (01:07:15)
Visible crew/equipment: When Ella is tending Char's wound, they get up, and while Char is putting on his shirt you can see his microphone clipped to the back of his pants.
Continuity mistake: In the scene where Char is proposing he puts his hands around her neck and they close in back in the next shot his hands are back on her shoulders.
Continuity mistake: When the guard tells Ella to "freeze," she freezes with her mouth closed, yet in the next shot, before she is given another command, her mouth is open. Then, in the next shot, you can see her facial expression has changed slightly. Since she was told to freeze, and hasn't been given another command yet, she should be physically unable to move in any way.
Continuity mistake: During the wedding scene they sing 'Don't Go Breaking My Heart.' Slannan and the Giantess join in in the far right corner, however when not in the close up where they are singing, they are not there.
Continuity mistake: In the scene when Char proposes to Ella and then the guards drag her away, the amount, gloss, and color of her lipstick change three times.
Revealing mistake: When the Ogres guard the door during the coronation, Nish's club just brushes past his guard's face instead of hitting him in the side of his head.
Continuity mistake: In the scene where Edgar is giving Ella commands, when he sits in the chair and says "I killed my own brother", his left hand is on the arm of the chair and his right hand is on the book on the table. However, in the immediately following shot, Edgar's hands are suddenly clasped in front of him.
Answer: He did in the film, but for the soundtrack she recorded the song with Jesse McCartney. In an interview he admitted to being a little nervous about the singing.