Revealing mistake: Right after "Without Love", we see Edna answering the phone. If you've seen the movie as many times as I have, you'll see that this is a recycled shot from earlier when Mr. Pinky calls.
Revealing mistake: There is one shot where Andrea, whilst dancing to avoid the security beams guarding the picture, puts her leg through a beam but nothing happens.
Revealing mistake: During the scene where the military loses control of London, and their snipers are told "all targets are free", you can see heavy padding beneath Infected/civilian victims' shirts, etc, as they're shot. Presumably it's to stop them injuring themselves when they fall over, or to hold apparatus for the blood effects, but it's too bulky to be part of the characters' clothing.
Revealing mistake: When Conrad throws the Russian over the cliff, as the Russian explodes, you can see that poor CGI actually makes him transparent.
Revealing mistake: On night 21 the time-stamp changes from 11:59:56 PM to 11:59:57 AM despite it not having turned midnight yet.
Revealing mistake: When the C130 is taxing on the runway (just ahead of the police search of the plane) you can see a C-17 in the background. The C-17 only made its maiden flight in 1991.
Revealing mistake: At the end fight scene when Lamia is laughing, you can see that her teeth are only darkened in the front, not the rear. (01:55:10)
Revealing mistake: During the film, the Nike tick on the Arsenal shirt is a reversed tick, revealing a flipped shot.
Revealing mistake: When Rasputin goes through the wooden barrier at the water park it is a clear CGI. (00:50:20)
Revealing mistake: At the end, there is a group of people with their backs to the camera, facing & waving to the Fantastic 4. As the F4 fly towards the camera and out of the shot, the crowd turns to continue waving to them. One small boy in white remains facing the wrong way, still waving, until another child grabs the back of his clothes & turns him to face the right way.
Revealing mistake: When Jack Gramm's Porsche explodes and make a flip in the air, the rear compartment where the engine is supposed to be is empty, and the rear axles and the tailpipes are common pipes.
Revealing mistake: After Amber and Jonesy are killed, the blood starts dripping on the son's face. Since when is blood black in color? This is a thick and syrupy-looking black liquid.
Revealing mistake: In the opening scene, the little girl pulls the cake over to her with only a few fingers which is near impossible. When the camera angle shifts and she lets go of the cake, it still wiggles as if she's pulling on it, showing that it's being controlled from the other side, most likely by an off-camera crew member. (00:01:25)
Revealing mistake: By the end of the movie, when Jamie Foxx is holding the dying Arabian cop, you can see that Jamie's neck injury looks extremely false.
Revealing mistake: In the barber shop scene, the barber takes a chunk out of Farley's hair with the clippers. A bald spot is shown a few seconds later. In the next scene, the bald spot is gone.
Revealing mistake: When Laura falls in the bathtub, a stunt is doing the fall, because her hair colour and style changes.
Revealing mistake: When Jessica Alba is in the dentists room with the chipped tooth, it's very obvious she's wearing a set of false teeth over her teeth.
Revealing mistake: Near the end, right when "little wonders" starts, Lewis takes a moment to look at his future family, Lucille, Frannie, etc. When there's a closeup on Lewis, his memory scanner reveals a reflection of no one in the gym, except for Lewis, even though people are supposed to be standing in front of him.
Revealing mistake: When Art is hitting the Trevor (the blinded man) character with the hammer/hatchet in the beginning, if you look closely, you can see blood coming from Trevor's head, yet there is no wound or cut. The blood is actually coming from the prop that is hitting him in the head. (00:09:00)
Revealing mistake: Seth is seen holding the alcohol-filled detergent containers, waving his arms and saying to Evan, "You bailed on me!" If the containers were truly full, or even half full, they would be too heavy for him to move up and down so easily. They were obviously empty.
Suggested correction: Not necessarily a mistake. Little kids can have a hard time keeping track of/focusing on things. I know little kids that have a hard time looking in the direction of the camera when their picture is being taken.
Phaneron ★
There's a difference between not looking at a camera when you don't care about having your picture taken and being able to follow superheroes that pass you, especially if you're waving at them. The reason it's a revealing mistake is because everyone involved had to pretend superheroes were passing them and the kid didn't know when to turn.
Bishop73