Continuity mistake: When Jaden starts climbing up the tree to follow Blair into the Obelisk Blue dorm, in the first shot of him climbing the tree, the branch leading toward the balcony is only a few feet long. Then there is a quick fade edit, and the branch is suddenly much longer. (00:03:52)
Continuity mistake: When the hairclip falls out of Blair's hair, it lands on the floor. Next to it is a spell card lying against the side of Zane's bed. Later in the scene, when Zane looks at the hairclip on the floor, the card next to the bed has disappeared. (00:04:40 - 00:05:27)
Continuity mistake: After Jaden realises Blair is a girl, there is a shot of Zane's room from above where Blair starts to run away. In this shot, some of Zane's cards can be seen on the floor after they were dropped. A couple seconds later, when Zane looks at the floor, the cards are now in different positions. (00:04:47)
Continuity mistake: After Jaden leaves the Obelisk Blue dorm, he says "What until I tell the guys about this", and Blair pops up her head up from some bushes she was hiding behind. The shot then cuts to a closer shot of Blair, and the bushes around her have changed shape. (00:05:58)
Continuity mistake: When Zane hands the hairclip back to Blair after the duel, he places it in her right hand. In the next shot, she is holding it with both hands. (00:18:08)
