Continuity mistake: When the family flies on their Ikran along the Metkayina city (Awa'atlu), there is one scene where it seems as if Kiri is missing on her Ikran. On all the other Ikran, the person can be seen (even Tuk). Kiri should be wearing some greenish "shirt" but where she should sit, only some brownish stuff can be seen. (00:50:29)
Continuity mistake: After Quaritch wakes up and jumps from his bed, there is a towel laying at the foot end of it, but in the next shot, the towel is gone. (00:09:25)
Continuity mistake: When Lo'ak and Neteyam landed at the destroyed maglev, Lo'ak loads the rifle. He and Neteyam both carry a long bow. In the next scene, the bow of Neteyam is gone. (00:14:32)
Continuity mistake: Jack and Neytiri successfully save their children and eliminate four soldiers from a group of six. However, during the extraction scene, all six soldiers reappear.
Suggested correction: The point is, they are not just six, they are (I think 12 in total)... Lo'ak doesn't sport the second group, which is why he miscounts them as "only six."