Factual error: The moon is full every night the highschoolers are at the lake house.
Continuity mistake: William H. Macy makes dinner plans with the Mayor and writes "Dinner with the Mayor" on the dry erase board in his office. He writes "Dinner w/ the Mayor" in the "Tuesday" slot. Then an intern comes in and accidentally wipes the appointment off the board with her shirt. Macy yells at her and tells her to rewrite the appointment on the board. The whole premise of the joke and pretty big part of the movie is that the intern rewrites the appointment in the wrong day, thereby causing the Hollywood people to miss dinner, enrage the Mayor and his wife and have the town turn on them. When the girl walks away however, the appointment is clearly rewritten in the correct day (Tuesday). This ruins the whole misunderstanding because although the appointment is in the wrong day later in the movie, at the moment the joke is supposed to be set in motion, there is no mistake.
Factual error: On the cliff top before the battle on the beach, you are treated to a lovely if fleeting glimpse of wind farm turbines, not really fitting for the 12th Century.
Plot hole: When Vlad enters Mehmed's tent, the entire floor is covered in silver coins and Mehmed remarks on Vlad's weakness to it. There's no way that Mehmed could have known about Vlad being a vampire or about his weakness to silver, as Vlad had killed every Turk after becoming a vampire, so nobody would be alive to tell him. Even the Turk found on the battlefield in the morning lived long enough only to deliver Vlad's message, but died immediately after that.
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: Angelica has flowers on her dress. During the wedding, they disappear and reappear between shots.
Character mistake: During the movie's opening credits, Sara is shown auditioning for Juilliard, which is misspelled as "Julliard" on a sign outside the room where the audition is occurring.
Continuity mistake: After Harry Zidler first sees Christian and Satine kissing, when they stop kissing, Satine's lipstick switches from being smeared to perfectly done and bright red when she walks and when Zidler is talking to her about having to end the infatuation.
Factual error: When the map of the German advance is shown, Switzerland is shown to be taken over. Switzerland was never invaded by the Germans. (00:05:10)
Suggested correction: It doesn't show German advances. It shows the German influence over Europe, symbolizing it covers all of Europe and then expanded towards the East. Italy was never conquered by the Germans either yet it was part of the axis and is shown being covered by black. Switzerland, though neutral, was fully surrounded by the Axis and their influence played heavily upon the country. Its a very crude simulation.
Suggested correction: It does not show the German advancement in true historical order, but more like a red shadow that expands across Europe in a steady pace. And just as the camera starts zooming in on Stalingrad, you can see a small sliver of red starting to spread on the south-eastern coast of Norway.
Continuity mistake: David Sloane (Sasha Mitchell) is the brother of Kurt and Eric Sloane (shown in Kickboxer, with Jean-Claude Van Damme). In the opening scene you can see pictures of the brothers, but the Kurt and Eric Sloane featured on the photos are NOT the Kurt and Eric Sloane from the Kickboxer movie. You also see pictures of Xian and Mylee, from 'Kickboxer'. Then later in the movie, when David and Xian 'meet', David asks Xian, "Who are you?" Well, he would obviously know, given that he's got Xian's photo hanging on his wall at home.
Revealing mistake: In the day following the Rider's first ride, Cage shows up at the street that has been burned down the center. A person very close to the beginning of that scene walks on the broken up rocks and it moves as if it were a pad or a sponge. It wasn't a rock moving because the street moves with the rock. It happens a couple of times during that scene.
Factual error: When Cattleya escapes through the sewer drain and winds up in front of the U.S. Embassy, she uncovers the manhole all by herself. Impossible for such a young child to do.
Factual error: Opening scene shows NYC 1962 as a 1964 Chevy Impala rolls by.
Continuity mistake: When Christine is fixing herself after the guys smashed her up, her front end is shown to be perfectly straight for its entire width and the hood is missing. Near the end of the scene, the front end is shown crushed and unfolds again, and the hood appears from nowhere.
Continuity mistake: As Dalton stands inside the bank vault staring at the cash, the scene jumps from a wide, distant shot, to medium, to close-in, just outside the cage. Another robber stands just outside and between jumps his gun position shifts from relaxed to raised to relaxed again.
Suggested correction: Whilst this is true, I don't think it is a continuity mistake. It looks to me like it is intended to suggest the passage of time between each of the three shots.
Factual error: When Mark types email addresses in to tell people about facemash, he writes to several people @harvard.edu. At the time the movie takes place, undergraduate email addresses were all of the form username@fas.harvard.edu. Furthermore, the network brought down by facemash would have been referred to as the FAS network. (FAS stands for Faculty of Arts and Sciences; the eponymous network covered all buildings within the College and Graduate School of Arts and Sciences.).
Factual error: In the scene where the Navy Seals are riding in the cars, the VA state vehicle inspection can be read from behind. It read "6 13" for June 2013. This would have been correct for the period the film was made, but not for the time of the incident.
Factual error: The German fighters depicted in the film are Messerchmitt Bf 109 G-6s, and every single one of them is using the Rüstsatz VI gun pod, that is, 2 extra 20mm Mg 151 cannons. The Luftwaffe only equipped their Bf 109s with the gun pods when they were going to intercept bombers. In this movie, even on the fighter vs fighter missions, they have these gun pods, which is inaccurate, because the gun pods dramatically reduced the turning performance of the Bf 109s.
Audio problem: When Reynolds is salting the asparagus the camera cuts back to Alma and you can see Reynolds' hand moving in a different direction but the salt shaker sound is still playing. The camera cuts back to Reynolds, and he's holding the salt shaker again. (01:06:15 - 01:06:39)
Other mistake: When Jaguar Paw is running to reach the corn to escape and gets knocked down by an arrow; Middle Eye was about to whack him when Blunted intervened. You can hear Middle Eye say in English "Get off me!" while he's being held back. (01:27:52)