Continuity mistake: After waking up, Lulu's clothes are suspended from the ceiling and she leaps from the bed down into them, getting them perfectly on her in an instant and then runs off. Her hat is not amongst the items, and as she runs off screen you see that she has nothing on her head. But the shot changes to her running directly to the bathroom, and suddenly her little red hat is on her head. (00:01:10)
Other mistake: When Fry and Colleen are lying in bed, his hand is around her shoulder but it is the same colour of Colleen's skin. (00:04:25)
Revealing mistake: The film was rushed to theaters, leaving a few mistakes which Universal fixed. In the original cut, toward the end, Judi Dench's human hand is visible, complete with her wedding ring. This was fixed for the re-release.
Continuity mistake: When Wallace races to get crackers, check the packet's logo. When the camera angle changes it's different. (00:08:57)
Continuity mistake: Gargamel finds out of the smurf he captured is Smurfette. She grabs the bars of the cage, but the position of the door hinges changes, switching from her right to her left, back and forth. (00:13:35)
Continuity mistake: Before Kay cuts the mop's handle, the mop is dark brown. After he cuts it turns to vanilla coloured.
Other mistake: When the mayor is talking behind the chainlink fence, with Brent in the background eating sardines, you can see as the mayor grabs the fence, his thumbs clip through the fence wire. This occurs on both hands and easily visible, particularly when Mayor Shelbourne says, "Otherwise, I'm just a tiny mayor of a tiny town full of tiny sardine-sucking knuckle-scrapers." (00:10:52)
Suggested correction: I watched this movie a million times and the mayor's thumbs are not going through the fence.
Then something's wrong with your eyesight, because it's very easy to see.
Continuity mistake: When the Dowager Empress is walking towards the door and says the cinnamon smell is from an oil, her reflection in the mirror exactly matches her movements, including when she turns, when it should show a mirror image. Note the blue sash is on the same side in both. A quick reflection of Anastasia's head just before when she says "I just want to know who I am" has the same problem. After they sit the reflections appears to be right. (01:09:40)
Revealing mistake: When Tracey goes around a corner on the boat, he clips through it. (00:06:04)
Continuity mistake: While at Dino Stop, Katie convinces her dad not to play it safe and to take a chance to save the world. Rick agrees and extends his left hand for the "all hands, Mitchell family on three." In the closeup we see Katie put in her right hand, but in the wide shot Katie's left hand pulls out. Also, note that in the closeup both Katie's and Aaron's positions between their parents are switched. (00:45:00)
Continuity mistake: When Overgirl, Blitzkrieg, and Black Arrow find Vibe at his computers, he dives to the right towards a hatch in the floor that is open. This hatch magically materialized from nothing as it was not there just a moment before. (00:36:00)
Revealing mistake: After Chuck steps on the toy duck, he looks up to see the alien family and their house behind them. However, there is no reflection of this on his visor, just an empty field and the trees beyond.
Continuity mistake: During the whack-a-robot game, a big chunk of the broken robot lies on the counter, but it disappears a shot later.
Factual error: When New Island's reflection is in a window on Giovanni's helicopter, it is not reversed. (00:15:19)
Continuity mistake: When Spencer says, "Lots of people believe in them, even though they never see them," Molly's bed does not have a headboard, but in the next shot, it does. Also, Molly is looking straight, but in the next shot she is looking towards Spencer. (00:00:27)
Continuity mistake: After Lugnut says "Pedal to the metal" and the Champ's mechanic says, "Come on, Cruise, come on", the scene cuts to Cruise and Wrangler on the race course. Wrangler is ahead of Cruise and Cruise is behind Wrangler, to his right. In the next shot, Cruise is suddenly directly behind Wrangler. (00:28:35)
Continuity mistake: When Alex tries to get Melman out, he is lying near the sea, but when Alex tries to get him out with the tree, he is farther away from the sea.
Continuity mistake: When Hiccup tries to lure Toothless with the fish, he drops his knife on the ground. In the next shot, the knife moves closer to him. (00:28:45)
Continuity mistake: In the carnivorous plant scene, Manny grabs the fruit (the bait), which is sitting in the middle of the plant. In the next few shots, the bait disappears and then is replaced with a bulb that housed the red and blue "wires".