Continuity mistake: When the dentist wants to put Nemo in a bag, it's a resealable one with a seam at the top. When he finally catches him, it has changed to a normal plastic bag.
Continuity mistake: Before Nemo is initiated into the Tank Gang, Brother Bloat introduces the Ring of Fire. Bloat then retreats and goes between the on-looking fish. In the next shot Bloat is on the outside/right. In the following shot Bloat is again in the middle. (00:38:15)
Continuity mistake: The "'For a bite that counts', alligator floss'" poster on the wall moves further from the window as Phillip Sherman grabs Nigel, then it suddenly moves back to its original position. The poster is first visible close to the window in an earlier shot. (01:19:50)
Deliberate mistake: When Dory is inside the whale, she doesn't have the scars from the jellyfish sting anymore. [This is actually a long-standing Disney tradition. The company seems to believe that it is less traumatic to see violence onscreen if the evidence is gone immediately (blood, scars, etc. always disappear). Still an error, but it wasn't the fault of the CGI animators.] (01:09:30)
Continuity mistake: As the fishing net is being pulled up, a fisherman is shown to the left of two wires on the boat leaning on his elbow. Then in the very next shot, the fisherman is in between the two wires, and now he is leaning on his hand.
Suggested correction: He isn't between the wires.
Factual error: At the end of the movie it shows all of the aquarium fish in the ocean inside of their bags. It also shows the bags almost completely out of the water with only a small portion under water while the bags are almost completely filled with water. With this amount of water the bags should be submerged underwater with only the little amount of air showing on the surface, because water is not lighter than water; water weighs the same. (01:32:40)
Continuity mistake: When Marlin and Coral check on the eggs in the nest, when they first look, no eggs can be seen at the mouth of the cave but a couple of shots later the eggs appear.
Suggested correction: The reason the eggs appear is that the camera may have moved downwards, thus closer to the eggs that would have been at the bottom of the hollow. If it was more upwards, as in the first shot, the eggs would have been below the camera's view.
Continuity mistake: Near the end, when Marlin gets the fishing net off Nemo and talks to him a little about sea turtles, the rocks and seaweed nearby change between shots.
