Marlin: If this is some kind of practical joke, it's not funny, and I know funny. I'm a clownfish.
When we see the close up of the whale's head while he is blowing bubbles you can see they spell the word SEX or SFX depending how you look at it. Very similar to what they did in The Lion King. See more...
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Finding Nemo (2003) - 20 mistakes
Directed by Andrew Stanton, starring Albert Brooks, Alexander Gould, Allison Janney, Andrew Stanton, Austin Pendleton, Barry Humphries, Brad Garrett, Elizabeth Perkins, Ellen DeGeneres, Eric Bana, Geoffrey Rush, John Ratzenberger, Stephen Root, Willem Dafoe (add more)
Continuity: In the sequence with the boat, its position changes. When Nemo is looking at it with his friends, it is a long way away. When Nemo gets angry and swims to it, it's suddenly very near the reef. Then, the diver catches him when he's only been swimming away from the boat a few seconds, but the diver has to swim a long way back to the boat. Finally, when Marlin follows the boat, it's very near again, because he gets there before it starts, even though he was temporarily blinded by the camera. The boat does all this without raising the anchor until it leaves.
Factual error: Throughout the movie, to make it more authentic, small impurities (specks) are seen floating in the water. Throughout most of it, with great attention to detail, the impurities are always seen to be moving with the flow of the water - back and forth. This always works except in the first scene with Marlin and Coral. The sun is shining through the water, and you can see the anemone waving in the water flow, but the impurities are all flowing in one direction, left to right, never changing according to the water movement.
Continuity: Towards the middle of the movie, we see a shot with Nemo staring out of the tank, depressed. The camera slowly pans toward the side of the tank and Nemo is reflected in the glass twice. However, towards the end of the movie when Nemo is playing dead, all the fish swim to the other side of the tank and Bloat says something like, "What's happening? Why is he playing dead?" The camera pans to the side of the tank again, but the fish are only reflected once this time. They should have been reflected twice.
Deliberate "mistake": Towards the end of the movie fish are seen to swim down in order to submerge the net in which they have been caught. Although the attempt seems logical, it actually needs power against the net to push it down. None of the fish seem to touch the net at the bottom however and if it is the whole mass of fish achieving it, then the bottom fish should have been squashed against the net which (again) isn't the case. 'What brings the net down?' is the question here. (Done deliberately by Disney/Pixar to be visually aesthetically pleasing.)
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.]
Factual error: After Nigel returns Marlin and Dory to the ocean it is raining and the sky is nearly solid with gray clouds. As Marlin and Dory speak bright sunlight is streaming down through the water all around them, illuminating the ocean floor. Even if the water is extremely shallow where they are swimming the overcast sky would not provide such bright, consistent light.
Factual error: Near the end of the movie, when the fish are inside bags and have crossed the street and into the water, you can see the water level in the bags is much higher than the water they are sitting in. In reality, the water level inside the bag would have closely matched that of the surrounding water.
Other: When Nemo swims off to the boat, a diver pops up and catches him, and all the fish react. But this diver should have been visible to Marlin and co. long before it reaches Nemo, as they are far enough from the boat and looking out into open sea, yet none of them reacts until the diver is right behind him. Also, bubbles should have risen into shot before the diver does.