Character mistake: When Chumley falls off the tree and his cards fall on the ground, Jaden picks up one and comments "There's like, a zillion koala cards down here" when he looks at it. However, all the other cards on the ground are face down and he only looked at one card, so there would be no way for him to know if there were a lot of koala cards. (00:03:58)
Continuity mistake: Jaden picks up a card Chumley dropped from the tree. When he picks it up, the card is pointed downwards, but when the shot cuts, the card is pointed upwards. (00:03:58)
Continuity mistake: After Chumley realises the water is shallow, Jaden and Syrus remerge after the raft Syrus builds fall apart. In the shot of them standing up, the log closest to Jaden has a rope wrapped around it twice. When it cuts to a closer shot of Jaden and Syrus, the log next to him only has the rope wrapped around it once. (00:07:57)