Continuity mistake: In the scene where Grace is talking about the Tree of Souls in the mobile lab, Trudy stands behind Jake with her right hand on her hip and left hand hanging down. After grace says "Outsiders are strictly forbidden," we are shown a close-up shot of Jake and hear Grace continue with "You lucky swine." In the background, we see that Trudy has suddenly turned 90 degrees clockwise and is apparently supporting herself with her left arm on what seems to be the same table Norm is sitting on.
Continuity mistake: In the scene where Parker is shown playing golf on the indoor golf course in RDA, the first time he hits the ball, there are two other balls lying on the course side by side. In the next shot, two are distant apart and in the shot after that, they are in their original position.
Continuity mistake: When Jake first gets into the "syncing" device and he says, "This is cool," Grace's hands are already on his leg. In the next shot she reaches for his legs, where he replies, "Don't, I got this."
Character mistake: In the beginning scene where the shuttle lands on Pandora, as Jake gets on his wheelchair preparing to alight from the shuttle, the man behind him unloading equipment has his exopack mask loose even though he is exposed to Pandora's atmosphere.
Continuity mistake: In a scene in the planning room (where the computer model of Pandora is being studied by Colonel Quaritch and Parker Selfridge), Jake is watching them move the model quickly to find something on it and they show his digital watch which says 2:19. Less than a minute later they show his watch again and it says 2:51.
Continuity mistake: There is a scene where Jake and Grace are tied up by the natives, shortly after they are cut down, Jake pushes Grace over a log to avoid an explosion, the shot changes to something else, then returning to the log, and we see that he's pushing her again. then the shot continues.
Continuity mistake: In the scene after Jake was just in his avatar for the first time, he and the Colonel are discussing things around a holographic 3D map. With each shot, Jake's arms change from being straight out holding the edge of the table, to clasped in front of him, with no time to move the position in between.
Continuity mistake: In the scene where Jake wakes up from his link and Grace asks him, "Is the avatar safe?" and he replies, "Yeah Doc, and you are not gonna believe where I am," her hand is on top of his shoulder. But as the camera angle changes back and forth her hand switches to the side of his upper arm and back to the shoulder without time to have made the move.
Continuity mistake: When Jake's avatar is running through the garden as he first enjoys having working legs again, he skids to a stop on the loose topsoil in the aisle of the garden. The next shot that shows him wriggling his toes in the soil reveals a pristine path of soil and no evidence of the disturbance his skidding to a stop caused.
Continuity mistake: When Eytukan orders Jake and Grace to be tied up, Tsu'tey and another Na'vi grab Jake and bind his wrists, his right on top. It switches to Eytukan shouting a war cry, and goes back to Jake; his left wrist is now on top.
Continuity mistake: When Jake is walking up to the Tree of Souls to ask Eywa for help, he kneels and reaches for his braid as if it were hanging over his shoulder when it is lying down his back. The angle changes and it is now over his shoulder. When he stands up as Neytiri tells him that Eywa protects the balance of life, it's suddenly down his back again.
Continuity mistake: When Selfridge shows Grace the unobtainium ore, he picks it up with his left hand. In the next shot we can briefly see him passing the ore from his right hand into his left hand. The ore magically changed hands between the shots.
Continuity mistake: When Jake tames Toruk, he confronts the Na'vi and speaks to Tsutey. While Jake is speaking to Tsutey, Tsutey's braids are over his shoulder. After Jake says "You are Oloektan," all but a single braid are behind his shoulder. After this, when Tsutey looks at the Toruk in the distance, a braid or two fall over his shoulder, in the next cut no braids are over his shoulder.
Continuity mistake: When Selfridge is on the indoor putting green and says "Grace, you know, I enjoy our little talks", a woman walks behind him. A few seconds later the same woman walks behind him again, in the same direction.
Continuity mistake: In the scene where Neytiri is showing Seze to Jake, Neytiri's ponytail changes positions between shots twice. She puts it over her left shoulder as Seze is landing, it's at her back in the next shot of her, then when she says "Ikran is not horse" it's over her shoulder again.
Continuity mistake: (Extended Edition) In the scene we see Tsu'tey badly injured on the ground, he asks Jake to finish him off in the "Navi way". Tsu'tey reaches out for Jake's dagger and Jake assists him in taking the dagger out of the scabbard. In the next shot the dagger is back in Jake's scabbard and a moment later in the third shot the dagger is now out of the scabbard and in Jake's hand.
Other mistake: In the scene after Jake first links to his Avatar body and they are getting ready to put the Avatar's to rest, Grace gets the human scientists to 'scat' and shuts two large gates behind them. There is a CGI error with Grace's left hand. Her hand is not holding the gate handle but is pulling it shut anyway.