Continuity mistake: During one scene in Camryn's Halloween birthday party (where she is wearing a silver mask), it is actually Tia playing this role instead of Tamera.
Continuity mistake: When Portnow meets with Bishop at the church, in the first closeup of Bishop's crossword puzzle the word "MUD" is the second word across at the top, and at the center of the puzzle the 4-letter word "GEAR" is written in the 5-letter answer - with the fist space left empty. However, in the next closeup of the puzzle, now the word "ETA" is the second word at the top and "MUD" is the third, and the word "GEARS" has the "S" added, with the letter "G" started properly in the first space of the answer. (00:10:15)
Factual error: Denham is obviously shooting a sound film - he has a sound recordist with him along with the bulky and awkward recording equipment typical for the era, and they discuss the problems of recording dialogue on board. But not once do we see him filming with sound. We see the crew recording dialogue - synchronised sound, recorded on location, which is utterly impossible given the equipment they have and the circumstances under which the fim is being shot. We never see a microphone, a boom pole or a tape recorder. His camera isn't even 'blimped' - soundproofed - and it's handcranked, which makes a racket. They can't be planning on adding the sound later - why have the sound recordist and his bulky and heavy equipment there with them if they are? We see the crew recording dialogue - synchronised sound, recorded on location, which is utterly impossible given the equipment they have and the circumstances under which the fim is being shot. The whole point of post dubbing dialogue is that you don't need a sound recordist in the first place.
Character mistake: When Lisa is taken to the hospital, she tells Kathy that she saw the ghost of Jodie DeFeo. The name of both of the DeFeo's daughters wasn't Jodie. Their names were Dawn and Allison. Jodie was the name of a demonic pig that the Lutz's daughter Missy had befriended.
Suggested correction: While this is true in the original novel, the writers chose to change it to the DeFeo's daughter's name in the movie. Creative license doesn't count as a mistake.
Continuity mistake: When Adam Sandler reverses into the police car, he damages the Bentley he is driving at the back end. When the police chase him, the back end is not damaged at all. (00:06:35)
Continuity mistake: In the scene where Avner shoots the first Palestinian, the dead man falls forward onto his groceries, but the next time the body is seen, he is lying on his back.
Factual error: We are told at some point that Nicole Kidman has dual nationality because she was born in the US. In the final scene, when she is talking with Sean Penn about her future steps, she says she has been deported and given one day to leave the country. She was a US citizen, so it is impossible that she would be "deported".
Continuity mistake: After Casey has turned down Harvard and is skating on the pond, she falls many times. When she falls for the fourth and final time, her hat falls off. In an overhead shot, the camera even shows it laying on the ground above her head. When she gets back up upon seeing Teddy with the zamboni, her hat has disappeared. (01:12:05)
Factual error: There is a brief shot of a couple driving through the streets near Eatonville, Florida. In the background a mountain is visible. There are no mountains in Florida.
Deliberate mistake: To make Jim Braddock look more heroic, Max Baer is portrayed as being very mean and hateful. In fact, the real Max Baer was an extremely pleasant man who was devastated when Frankie Campbell died after fighting him. Many boxing historians and sportswriters have complained about this inaccurate depiction of Baer.
Continuity mistake: When John is driving to work and he hears Anna on the radio, he swerves to avoid a car. From inside the car you can see that there are no cars in the rear window, yet when the shot changes to an outside shot, there are 3 cars. (00:33:35)
Continuity mistake: After his father's funeral, when Drew turns on the ignition and in following shots, the leather band that he wears on his right wrist (not the watch) is clasped with its strap facing his thumb, yet when he passes the sign for 60B, the band goes round the opposite way. Then, when he listens to The Hombres the leather band is flipped back, but when he picks up Global Business Today magazine it's switched yet again, and so on. (01:43:00)
Factual error: When Yuri is narrating about selling weapons for the US government (this was around the scene when he sells M-16's by the kilo), he mentions Lieutenant Colonel Southern. However, when you see the him, he has Colonel rank, which is a silver eagle. The Lieutenant Colonel rank is a silver leaf, not an eagle.
Visible crew/equipment: When the Muslim armies approach Brendan Gleason's castle there is a side shot of the Muslims army coming to a halt. You can see the marker stake with yellow tape at the top (used during production as a mark). (01:10:10)
Continuity mistake: When Constantine manages to get the mirror through the window he falls on his back. To the right on the screen a chair lies on the floor beside a dresser. A few shots later when it cuts to Constantine getting up we can see the chair has changed position as its back now covers the opening of the dresser. (00:08:15)
Continuity mistake: In the final dinner meeting of the Merchants of Death (MOD Squad),the gun lobbyist gets a piece of pie with cheese on it, takes a small bite; then the alcohol lobbyist attacks it with her fork for a bite, pulling all the cheese off and toppling the little American flag in it. In the next shot of Bobby eating, and a closeup of the dessert, all the cheese is back on it and the flag is upright again.
Visible crew/equipment: In the scene where the piano collapses, after Madea's chainsaw rampage, you can see the wire that pulls the piano apart.
Revealing mistake: Towards the ending in the strip club, Locus is getting arrested. When it shows his hands being cuffed, it's not his hands but those of Charles in an earlier scene. You can tell because the person is wearing long red sleeves and a Rolex.
Continuity mistake: As Rachel is preparing the peanut butter and jelly sandwiches, she places the knife on top of the open PB jar in a closeup, but in the very next shot the knife has disappeared, then reappears again. (01:23:15)
Continuity mistake: In the fight between Barkis and Victor in the church, Victor slashes at Barkis with the fork and leaves 3 very noticable tears in Barkis' jacket. These tears aren't seen in any of the subsequent shots. (01:09:15)